Skip is correct about square flange vs spread bore on the Tomohawk intake, or any other single plane intake. ALL of them require a spacer to make best power. With a Q-jet or TQ the huge rear secondary throttle plates stick too far into the plenum areas and will cause substancial power loss. Even with a square flange carb they love a spacer to get them up out of the plenum some.
I've tested quite a few single plane intakes, dyno and at the track, and wouldn't use one without a well blended 1" spacer on them.....FWIW
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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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