Join Date: Mar 2002
Location: Austin, TX, USA
Secondary opening could also be a factor. If the secondary opens too soon or too late, accelleration will be affected. There is a clock spring on the passenger side of the secondary actuator plate. Consult a manual for the adjustment procedure. I'd start by stiffening the spring an 1/8 to 1/4 turn, since it seems they usually are set to open too soon. If performance is worse, then loosen the spring 1/8 to 1/4 turn from baseline and see what happens.
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI