OK I've just done a cam and head swap and I'm trying to use my original carb, just curious on what you guys think for the jet setup. I've got a ZZ4 bottom end with a new xr-288 comp(520/540"-236/242 dur) with a new set of ARF 195's. 1.5 narrow body's. The carb is a ZZ4 specific 650 Barry Grant with 70's up front and 78's in the back. I know the carb is a little small for what I'm doing, but I'm trying to make it work for a little bit until I can get a 750 HP. Anyway thinking of running 76's to replace the 70's and keeping the 78's in the back. What do you all think?

 

Run it the way it is and see where you need to go from there.