Sixpack on a 318 engine ?

The 365/375 horse 327 had a cam in this range. Speed Pro still sells it. Put it in your 318 along with a nice intake and carb and some headers and see where you go. I bet that 327 had 10/1 compression at least which the 318 lacked. A 300° cam is pretty nasty especially in a small cube engine.

Speed Pro # CS118R 254°@ .050 295° adverttised duration
.485 lift 114° Lobe separation.

The Chevy guys say it comes on strong at 3500 to redline. (no idea what that is but guessing 5500+)
If I remember right, the 365 solid lifter 2.02 head motor had 11 or 11 1/4 to one.
Put a modern solid cam in, some econo w2s on it, 10 to 1 pistons, airgap intake with a 750 dp, headers in/on your 318, and hang on. 400+hp to thrash 327s (and 350s) with.
Edit: the solid cam 327s redlined at 6500, would go past that. I spun my hydro cammed 350 (370hp version) to 7500, cause it would.
It would have been quite a bit faster if I had shifted at 6500. DOH!