Heads question

i'd run the J heads too (I do in fact ) but it isnt that much$ $ to drop a set of 2.02 valves into them either. Infact you don't even need to replace the seats - a good machinist can back cut the 1.88 seats to open them up for the 2.02 valves. My j heads happened to be the factory 2.02 version of heads and when I dropped a seat once the replacement part were the same for either head ..

and if your running ported /polished with 11.5 compression you probable need as much air as you can get or it would be like running a 2bbl on a funny car (large exaggeration but you get my point )