Generally an early 73 ish Qjet is going to have a little better idle down tube size than the lean 78s, so if any cam upgrade they will idle much smoother and not have main booster "drizzle" with throttle blades open too much to get it to idle.
I put a 73 SD SR carb on mine with a mild cam upgrade and it was a world of difference. Have a 73 "regular" 750 Q jet on the 81 400 and it idles well also.
__________________
Skip Fix
1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune 13.43@103.4
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
|