318 Cam

People can scream old technology all they want, You just can't go wrong with Mopar purpleshaft. You can run the 430/450 cam or the 450/455 cam. Both work well in a 318.

I run the 450/455 purple cam in my 318 which has a more noticeable idle than the 430/450. It has a pretty nice chop to it and runs well after we installed it "straight up" .

When using a 340/360 head on a 318, what you gain in flow will be offset by lower compression. To optimize you're setup aim for around 9:1 and get headers. You can shave the heads around forty thousanths a side and then
have you're intake faces of the heads milled to match up so that you can use any intake; rather than shaving an intake that will only be good for one engine.