I am upgrading from a set of gt40 ( 3 bar) heads to a set of TFS 170's with 58cc.........should I go with a stage 1 TFS cam or just use a set of 1.7 roller rockers ? The 58 cc limits cam choices to under 530 lift I was told and the stage 1 is .499/.510 lift, I' not sure of the difference a set of 1.7 rr would make with a stock cam, anyone know what the lift of a stock cam would be with the 1.7's? Also what about the compression ratio, what would it be with a stock bottom end and 58cc heads?