318 differences ??

You will need the mounts that came off the 75 engine. The early engine has very small connecting rods and heads with unhardened valve seats. Depending on how much power you are wanting to make from the 318 the rods could be an issue. Some say the early heads are OK with todays fuel and some say the seats won't last. So far I have no issues from the 69 heads on todays crap fuel but I don't put many miles on it.