I discovered an oil leak on the spark plug side of my head at the gasket, I lose a lot of oil. I pulled the head of my parts car and am wondering what steps I should not overlook before swapping them and replacing the gasket. I am currently getting 154 across all 4 and dont seem to have any coolant in the oil or vice versa. Should I reuse the head bolts, if so from which head? Should I use the pushrods from the original head or from the donor? Also how can I be shure the ports are both oval, as my 76 b210 4 door sedan (donor) has, going into a 76 b210 coupe.

Thanks in advance, Keith