I was also going to mention, not sure of the yr engine/heads you have.

check the pushrod hole,they should be the larger hole on the later modle 360 heads.

if it is the small PR hole,you can run them but need to make sure the PR has clearce thru its travel in the PT hole. some slight cleance grinding maybe needed. not much but some is needed.

if you check the block for yr post up what yr 318 4-v it is.

IIRC, the vin said a 2-v 318