Anybody go from performer to an rpm air gap

My 2 cents:

The intake comparison aar posted should answer your intake question. I compared a Holley Strip Dominator to a Weiand Stealth and the Holley was a bit faster BUT I have a LOT more gear, converter and cam duration. The Air-Gap should fit the bill. You can experiment with an open as well as 4-hole spacer. But simply fine-tuning the carb with jets, squirters and pump cams can yield noticable results IF you can get it to hook better. Are you simply spinning or wheel-hopping too?

I don't recall if you mentioned what's in the front suspension, but looser shocks and 6 cyl. torsion bars can help. Stiffer shocks in the back as well. The shackle spacer is a good idea. I got by with a 3/4" spacer.

But depending on the track, sometimes it's better to just add weight to the trunk - as long as it's done SAFELY and LEGALLY to help traction while you sort things out. I added almost 150lbs to an old bracket Challenger I had and the consistency improved quite a bit helping me win more.