IMO comparing a carbed poncho V-8 w/ a 3-speed non-OD trans to a fuel injected LS V-8 w/ a 4-speed OD trans isn't a fair comparison in terms of mpg- naturally the newer design which is lighter, has less rotating mass, is computer controlled, and has an OD trans will get better mileage. A 7.6l V-8 will also use alot more fuel than a 5.3l V-8, so the cid difference would also play a factor here.
It would be interesting to see what kind of power and mpg a 350P would make if treated to similar gear as an LS1- fuel injection, aluminum heads, roller cam, high-flow exhaust and of course good pistons and rods. I used to pull down 16-20 mpg w/ my original 350P, e-performer, 625 cfm AFB, stock cam and exhaust, so I'd image the good ol' 350P could come close- not bad for a 50+ year-old engine design.
We already know what engine would make more torque, so there no point in going over that.
Geno
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