High RPM Backfire when fully warmed

Newbomb Turk said
You’d poop your pants if you see what my basic 750 tuneup looks like for jetting. You might faint if you see my 750 tuneup with annular boosters.

I sweat it still but I’m getting used to it.

Maybe but I’ve seen a lot and rarely poop my pants. I like when guys do crazy stuff and it just works out. I was tuning (his carb not mine) a friends stroker mustang yesterday and the damn thing wouldn’t idle for the life of me. Had jetting where I wanted it, TSR where I wanted it, pcvr where I wanted it, hsab where I wanted it, and it wouldn’t freakin idle. Finially looked at the iab and some asshat previous had drilled them (I measured once I started screwing with em) to .130. Once I stuck some 10ga wire in em it ran like a top and idled at 600rpm with a 262@050 cam.