Best 273 and 318 builds (NO 360's please)

How does that engine run,Im building a motor just like it for a friend. One thing different going with airgap.

Runs sweet. No problems at all. I really haven't opened it up to hard yet. I only have a 7 1/4 rear end so I'm waiting to see what it will do after I swap to an 8 1/4 sure grip I have.