I picked up a 1968 ss/rs Basket cass a few years back. It’s been sitting in the back of the garage now for a too long. I am slowly pulling all the parts I need together. The original engine is gone. It is a 4 speed car with a Muncie and 12 bold rear end. My plan is to put a 396 in it. Looking for as close to original as I can find. It will not be a vin matching block obviously. She will be groto blue if I go back original. I’d prefer lemans blue but we will see. Looking for guidance here. I believe the block casting number should be 3916323 or 3935440. What about the heads?