six pack expert wanted..???

Agree with the Promax baseplate, the rear carb will be a b*tch. I purchased one for my setup, best money I ever spent. I'm not a techie, but you can try to crack front and back carb open one turn on the linkage to get rid of the stumble (worked for me with high lift cam). I haven't messed with jetting, or PV at this time because it looks like PO set it up already.

Be careful with those tiny idle mixture screws they are easily broken .