Greeting friends, I am just replacing the cylinder head on my 92 Previa with a rebuilt one. The exhaust cam on the exchange head has an extended snout which I assume is from the Super Charged Previa. Mine is non S/C. I don't have the lift specs for the head. My questions; 1) Are the cams interchangeable? 2) If not, any thoughts about transferring the cams from my old head given that they were not machined or run in on the exchange head. Many thanks!