I found this picture which should help. It shows how much different a spread bore intake pattern is to a square bore. All of the Edelbrock AFB and AVS clones would be square even if they happen to bolt up to a spread bore intake using the dual bolt pattern.
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73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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