Probably a Dumb 318 Question

People that want to run highway gears and no overdrive but want to make 400+ hp probably should be looking into running large low rpm 0.8 - 1 hp per cid engines.
❌ Pointless and backwards.
or a big block. ;D

Yes that was what I was getting at :)

400 hp at 1 to 0.8 hp per cid is 400 to 500 cid.
Then you should have said that to begin with.

Ugh!