Flywheel Question

So if you already have 3.91s, this would work well wit, waitaminute;
Why in the world is that 508 in there then?
I mean you already know it's a "race" cam.
Here's my opinion;
here's what you need to do; Pull that508 badboy. Go down to something like 228*/110. Get a fast-rate,hi-lift cam designed for the .904 Mopar lifter, with maybe 1.6 arms. Get any regular non-od Mopar box, a heavy flywheel and 3.55s or 3.23s.
What's that come to? I mean over and above the Aisen?
Lesee; 250 for the box,another 250 for all the pedals etc, 50 for the tank flywheel,100 for the 3.23s(nobody wants those), and say 500 for the cam kit, and the M1s gotta go,so there's another 250 there. So we're up to $1400 so far. Add clutch and driveshaft, and incidentals say 2Gs. Now what were you looking at with the Aisen? Compare.Sell your stuff. Compare.

FWIW Shifting will get boring too, cuz with 3.23s it's pretty much a two gear deal, cuz 2nd gets you 84 mph @6500.
If you really wanna row gears you will need a very small engine, with a very small operating window with a lotta gears and a very steep rear gear. Then you will get to row three gears, to 60; or maybe 4. Remember the 84 Hyundai Pony?
-The smaller cams are way more street fun cuz the torque is always right there. Waiting for the 508 to come on line with 3.55s was disappointing for me; as it did not wake up until 50mph, and top of first was 60mph.
Not so with the smaller stuff, they wake up much earlier. Their done early too but , but that's ok cuz most of the time you'll be speeding anyway, somewhere in first gear, and either of these two will smoke 275s to 60 with 3.55s. At least mine did/does.
-Now consider;2600@ 65 with 27 inch tires, and 3.23s. And about 10% more with 3.55s.
-Keep in mind the Dcr change with the cam swap.
I can't say how much you value that 508, but I can say with utmost assurance, that I do NOT miss it. Both my Hughes cams did/do/have, pulled to 7000 with no complaints, time and time again. The smaller cam pulled my 4000 pound loaded Barracuda with a 2.02 final drive ratio, for hours at 85 plus mph, returning incredible mileage. With 10.7 Scr/8.7Dcr/aluminum heads, it burned 87E10 always. The bigger cam dropped the Dcr a bit, and does not get near the mileage, but she's a sweetheart in every other way.

Fwiw, stick-shifting will get boring too, cuz with 3.23s or even 3.55s redline in second will be speeding, so you still only have 2 shifts; the 1-2 and the 2-4.
On the other hand...going back to post #8, If you really wanna row gears that Aisen might survive behind a 273 (4.47liter) or a stockish lo-po teener(5.2liter), and you can almost keep those 3.91s....* 3.55s or 3.23s would be better, but the 273 would rock with 3.91s.
And then it hit me. If you detuned that 340 to 273 status, man that could be fun, with the aisen and 3.91s What you are looking for is a shift rpm around 4500 to no more than 4800. That would put you at 65 mph at the top of third;4550rpm. That's now 3 shifts;1-2,2-3,3-5. Unfortunately the 3.91 x 3.83 starter gear = 14.98. That's prettydeep. Redline would be 26 mph in first. At least it wouldn't likely blow off the tires.And cruise with the final drive of 3.09 would be 2494@65.
Bench-racing at its bs best.I still think that tranny has too big a spread from lowest to highest gears, for any V8.