Quote:

Has anybody tested the two heads to see the gains?



Here is my experience

Low compression 340, similar camshaft to yours, Old Offy intake, 2.02 valve 915 casting Iron heads (basically the same exact thing as an "X" head,)2800 converter, 3.91 gears and a 26" tire The car went 13.80's consistently.

WITH NO OTHER CHANGES I replaced the iron heads and reassembled the car with 63 cc edelbrocks. First day to the track the car went 12.81@106mph. Took a full second off my ET's. You have to understand I gained about 1 point in compression doing this swap as well going from 8.5:1 to 9.5:1. The edelbrocks have a smaller CC combustion chamber, so that was likely part of the reason for the power increase.

Cliff Notes :
My car went 13.80's @99mph
I put on a set of edelbrocks and the car went 12.80's @106mph
I was very happy with my purchase

You should get a set too.

-Dustin
67 Dart, 9 second, 392" G3 Hemi
68 Barracuda 340 F/SA