I have an intake that almost nobody has messed with.....and I like it that way

It's a STR-12 for a smallblock.

I've done the only "known" modifications with dams for better fuel distribution. I have an a/f meter (LM-1). I have bungs in both sides of the exhaust. Based on the readings / and the modifications / and the plug readings, everything is good to go for A/F and carbs. I've got this think tuned well.

The problem with bucking and kicking is under 1700rpm or so in any gear. This started when I went from a sluch box to a 4 speed. It's not the distrib curve or anything mechanical. Might be the cam, but I'm thinking of trying to reduce the plenum volume to see if it's a low speed air issue inside the intake.