Picked up a 1975 2f engine that was told was a good running engine reported by previously owner who had it in a storage for a long time he was going to reseal engine and removed the head and pulled the lifters out and didn't Label there placement ? Question is do I just throw them in or is there a better option to try to match the lifters to cam lifters do not seem to be worn. Engine has flat top pistons so I think it has had some rebuilding done.