Small block gas mileage DD magnum/LA ?

Here are, what I found in my quick search, for factory originally installed Mopar cams .
5.2 cam; 251/264/113Lsa
5.9 cam; 249/269/109Lsa
Can anyone verify if these are correct??
And does anyone know,for sure, what the original installed centerline was?
I keep bumping into some crazy-looking numbers.

The reason I ask is,because, if you run log manifolds, that 5.9 cam has got some economy potential.
With logs, and for this application; you can time it however you want. I mean 269 exhaust degrees is a ridiculous number, for the size of the intake.

See if you can follow along;
this is the 5.9 cam;
the overlap on this cam is ; (249+269)/2 less (109 x2) =41*
That looks not gas-mileage friendly.... on paper.
but lets install this cam at 108*. This would make the compression cycle to be 128*, and the Ica to be 52*
The Power cycle would be 115* ( a lot) and the
Effective overlap shrinks to 34*

Now, lets look at the 5.2 cam. In at near split overlap this would be an install of 110*
The Compression would be 125* and the Ica comes to 55*
The power cycle comes to 111.5, and effective overlap is 31*.

Here they are stacked up so you can see what's going on. The 5.9 first
249I/269E/128C/115 P/ 34eO and 52* Ica 5.9cam (109LSA)
251I/264E/125C/111.5P / 31eO and 55* Ica 5.2cam (113LSA)

So lets analyze this;
Intake duration is a wash,
Exhaust is a wash
effective Overlap is a wash
Compression degrees is plus 3* for the 5.9 which will translates to about plus 5 or 6 psi cranking cylinder pressure
Power extraction is plus 3.5* on the 5.9. which ordinarily nobody cares about, but 115* at a low cruising rpm, IS a big deal, cuz, this provides additional time to get rid of the exhaust thru the logs.

Ok so what does that 5.9 cam look like installed ?
Did I read that you are at 5300ft elevation? If yes, here we go...
EDIT; ok no WIKI says 950 ft so , here are the proper figures;
According to the Wallace Calculator;

Here is the 5.2 Magnum/ 5.9 cam
Static compression ratio of 9.2:1.
Effective stroke is 2.82 inches.
Your dynamic compression ratio is 7.98:1 .
Your dynamic cranking pressure is 157.95 PSI.
V/P (Volume to Pressure Index) is 128
This is bang on!, about as good as it gets

Here is the 8/1 318LA with the 5.9 cam
Static compression ratio of 8.0:1.
Effective stroke is 2.82 inches.
Your dynamic compression ratio is 6.95:1 .
Your dynamic cranking pressure is 130.93 PSI.
V/P (Volume to Pressure Index) is 106
158psi versus 131psi, and 128VP versus 106VP. With compression being the ONLY change..... See what I mean? That 27psi is a huge sacrifice



For
"on the cheap",
at 950ft
If the cam specs I found are accurate.
really, IHMO, you only have this one option;
5.9 cam into 5.2 engine, at 9.2 or better Scr.




Now, IMO, for fuel-mileage, you need three things
1) as low a cruising rpm as possible
2) as high an Effective cylinder pressure as is possible
3) as drastic a friction reducing program as you can muster
4) a heckuva tune

I could tell you that my 367, on one point-to-point, long-distance trip, got me 32 mpg without much trying. But I've been called a liar for saying that.
But if I got that, here's how I mighta done that;
1) geared 65=1533 rpm , using an A833od-box and a GVod behind that.
... (3.55s x.71od x.78od= final drive of 1.97)
2) about 11/1 Scr, with cranking cylinder pressure over 180psi@ 900 ft elevation
3) My Barracuda, takes forever to coast down from hiway speed. I haven't measured it, but I would estimate it takes between 5/8 to 3/4 mile, to drop from 60 to 20mph
4) a heckuva tune.

FYI
Here is what the 318LA with the 5.9cam actually wants.
Static compression ratio of 9.3:1.
Effective stroke is 2.82 inches.
Your dynamic compression ratio is 8.06:1 .
Your dynamic cranking pressure is 160.08 PSI.
V/P (Volume to Pressure Index) is 130
But getting to 9.3Scr into a 318LA, is not gonna be cheap