I ran the thread about "hope they fix it but if not" concerning carb problems with my engine.. I'm not running a 302 but rather a roush 351W however, did have at first a 650 speed demon on it. As a matter of fact we put a couple of them on it trying to get it right. ended up blowing up the motor..well sort of. it was running so rich because of a few other factors that caused the power valve to be open 99.9 percent of the time the engine was running that it ultimately turned the
oil into water, well it might as well have been for all the lubrication it was providing. Anyway I never changed the jets from stock on mine but the builders advice once he put it back together was to run primary and secondary as close to "square" as possible meaning jet sizes the same on both sides. I did however make another change that you probably won't have to since you engine is "crate" I went to a 750 mighty demon.. basically a holly 4150HP with mechanical secondaries vice the speed demon with vaccuum secondaries.. The cam profile I am using produces next to zero vaccuum from the moment you touch the accellerator so the vaccuum pot was useless but it also produced the problem that led to destruction.. causing the power valve to stay open so I've also plugged the primary power valve. I am also running 81 in the primary and 82 in the secondary. I don't know for sure but going all the way to 60's on yours might be a bit on the lean side, just my opinion. If it were me I think I'd stay low 70's and try to set them as I said "square". Just my point of view. take care and good luck.