and to add to this how would stock bore do? and as far as the head goes.Im assuming you would want to use some slightly larger cams and stronger retainers and springs? and as far as the intake manifold on the a1? and should i keep my a1 head or go with an b1? or b20?and crank wise what should i wanna aim to do with that.And will 440cc injectors be suffiecent for 10-15 psi? And the biggist and most importent.Tuning?!!?!