302 heads

ok thanks, are they prone to cracking? if so is it something I can see with close inspection?
All hardened seat heads are prone to cracking from the mid '70s to now. Iron cracks, aluminum warps.

Oh for God's sake. Do yall have to split frikkin hairs about everything? The 302 heads are designed for the 318. I bet some of yall have never run the damn things before. I have. On both a 318 and 360. They ran fine. They have plenty enough potential to get 325 or more HP on a 318 with good parts choices.
I would skip over them every time for something that's supposed to make power, especially if money had to be spent. My running them- it was more worthwhile having lower CR. Motor woulda been pretty decent had I put 360 heads on it. Might they be worthwhile? Sure. But if you're gonna run 318 heads there isn't really much difference in them. In stock form none are very good or better than each other. A better cam and converter would be a much more worthwhile investment than machining 302s.

They are a fine and dandy head for a stockish build but I wouldn't expect any real power come on guys let's call it what it is they are smog heads never had any intent on supporting power they were designed for fuel efficiency and lowered emissions
The smog 360 heads do almost the same job of supporting power as the pre-smog 360/340 heads and the 308s excel in some areas. But those were larger port heads than the 302s that were more meant to be ported and run.

302's are for cars, but isn't there the same style heads that were used for truck engines?
Cars, trucks, vans, don't matter- '85+ 318s had 302s unless they had 360 heads. Trucks, vans got flat tappets before TBI though.