The Performer RPM has always been great for street use. The Performer 289 isnt bad either,.. but if you need a few more usable RPM,.. the RPM is the better choice. 600cfm carb is all you need. I ran 12.20's @110 with nothing more than a 600 4150 double pumper on a Vic Jr intake. Not advisable for daily street use as the intake kills low rpm torq.

As for the dizzy,.. I dunno. The Proform uses vacuum advance. But the top half is all GM HEI. So in my opinion converting it to mechanical would be cake. I'll swear by the Proform HEI for SBF. I used one on my old 306 and spun it to 6500 on a regular basis at the track and never a misfire or any issues. I convinced my father inlaws buddy to buy one for his motor that I converted to carb in the 86 Country Squire and he is tickled as can be with it. Daily drives the car. Its been problem free for almost 6 months now. Also,.. I just used a 600cfm vacuum secondary Holley Avenger carb. $250 through Summit brand new.

Hurst