what gsk works better with stock valve springs and stock inj. the 3 or 4.... weres the best and cheapest place to buy them?????

You have to get 60 lb springs to run over 3200RPM. I would just get the 3GSK if anything, then you don't need the updated valve springs. 4k RPM's is a little unnecessary if you ask me.Not sure about the cheapest place.