I have seriously considered the Anderson B-21 cam, but im not sure of the specs of the cam, they say you can run it with 1.7s and stock pistons and my Edelbrock Heads I just put on but im nervous about piston to valve clearance. With the b-21 do I need longer pushrods? Also they say minimal 30lb injectors and 80 mm mass air, is that mandatory or just recommended?