Alright, first I must say that people obviously think I'm nuts. Drove around tonight with gloves, hat and hooded sweatshirt (40 degrees outside) clutching a flashlight under my chin so I could read the vacuum gauge that I hooked up and routed through the firewall.
Here's what I did tonight and the results.
Changed to pv from a 2.5 to a 3.5
Changed main jets from 72s to 70s
then adjusted the idle and took a drive.
Vacuum at idle was again around 5. Car idled well and fumes were much better. Cruising vacuum was about 14 or 15.
When I stepped on the pedal, vacuum would fall to about 3.5.
However, now when cruising in 2nd or 3rd at 2500 or so and stepping on the pedal, engine would hesitate and miss badly for a few seconds - I even got one backfire through the carb
I then came back in and changed the position of the accelerator pump cam from the #1 hole to the #2 hole, took it out for another drive and still had the hesitation/miss.
Brought it back in and changed the spring in the secondary from the standard spring to the lighest spring (short yellow) and took it for a drive. Again, there was no bdifference and the hesitation/miss was still there went stepping on the pedal.
I'm thinking that I should bump the pv from a 3.5 to a 4.5 or 5 and that I should increase the discharge nozzle from a 31 to a 34 or 35 (I also planned on doing that tonight, but bought a 31 thinking that it had a 28 in it, but it already had a 31
)
Your thoughts?
Thanks
ps
Rick, I checked the things you mentioned and I think I am in good shape there.