are the cams from a d16y7 and d16a6 interchangeable? are the vavle springs the same? i have access to a gude head (from a d16a6) and i want to use it on my d16y7 block, my question is can i run my stock cam from the d16y7 in it at least for now and the same for the springs can i use the ones from my y7 head? are there going to be any distributor problems? has anyone done this?