Newer vs Older
the gear is the main factor.
What he said;
I know you didn't ask for this, but here are some examples;
get yourself an A999 and
BIG gears, and save a boatload of cash and endless frustration.
The slant just can't cover all the bases, so choose one or two and call it done.
As a city car, you might want 3.73s and a 2400/2800TC to go with that 2.74-1.54-1.00-locup transmission. In first gear; this will far far FAR out perform just about anything you do to the engine if you keep the 2.73s back there, short of supercharging it. And quite possibly/very probably, thru most of second as well.
Here are the
final drive,torque-multiplying, road gears, with tire correction;
First the 3.73s and A999 with 28's; 8.76-4.92-3.20, and
then the 2.73s and A904 with 26.5s; 6.05-3.59-2.47
First gear is Plus45%, second is Plus37%, top gear is Plus30%
Draw your own conclusions.
What's it gonna cost to build your engine to match those numbers?
the gear is the main factor.
3.73s will get you 60 mph @~4340 at the top of second gear,with tall-boy
28s.
The starter gear is 10.22, before tire correction.
28mph will be 1930 cruising in 2nd, and 3600 in first at WOT; Kapow!!.
Forget the cruiser gear; this is the sacrifice you have to make with a NA stock-slanty. If you gotta know; 65~2910......60~2685
If you do the math on stockers, and I'm gonna guess a little;
The 318@1850/904 with 2.73s, is putting down about 1200 ftlbs on the start line.
The 225@2800 /999 with 3.73s maybe 1800. Yur gonna need a "posi" And
The 225@1850/904/2.73s,about 700. If you hop it up with; more compression,a bigger cam, a 4bbl, and a free-flowing exhaust? still about 700, maybe 770tops,lol.
the gear is the main factor.
_________________
I built a similar combo in ~1978 with a 69 Barracuda 904/2800 mind you and a recently remanufactured chain-store-bought, stock spec, 225. And had a hoot of a time for around 3 years, until some younger kid (I was just 25 myself), made me an offer I couldn't refuse. It wasn't 340 fast obviously, but it was sure fun hearing those 6 cylinders screaming out the back, in two gears.
