Anyone know if I'll have any issues with the on board computer when replace my "cracked" heads with the Hughes HD heads w/ oversize valves. Also, any comment on wheather or not I'll have problems down the road when I have to get this thing smoged (Ca. truck)? Should I stick with the stock valve size? Seems like eveyone I've asked (reps etc) either don't know or aren't sure if It will be a problem.