how much horsepower from my 318?

I would suggest that you save your money, not do a thing with the 318 and go and buy a running 360 with a 4bbl and intake. you can find them easily for $200. much better bang for your buck.

But the mount and converter are a months pay........ on top of the engine he already has...

What is up with you 360 guys, gawd, almost as bad as the 350 guys......

Chevy guy #1: Dude, nice camaro, whats it got in it.
Chevy guy #2: A 325HP 327.
Chevy guy #1 Oh, dooooood, you should put a 350 in it........