318 build!!!

If you do go the Magnum route.

PNP doesn't allow batteries in the yaad, might want to sneak one in taken off the battery rack when they aren't looking and take it inside the yard, bring it back when your done.

Honestly, if you can't do the compression test, the newer engines don't have the drawbacks the old ones do, they go forever thanks to better metalurgy, minimal core shift and metric rings. Pick the one that feels tight when you crank the front with a rachet, doesn't have too much gunk in the lifter valley and doesn't have chips of metal when you pull the oil pan and move on. Guarantee you can still see crosshatching on the bores.

Have them mark the heads, and take the mini starter too.

Also, the whole crack between the valves is more the sky is falling than anything else, sure they may crack, doesn't mean it's gonna hit the water jacket. Check them out, wish I would have investigated mine further before I pulled the trigger on new ones...