1987 318 LA

yep. it'll be fine.

plain white rice kinds of fine.

but you can still add a *small* cam to the stock compression bottom end and see a fairly sizeable gain.

which you should do because you're swapping the cam anyway.

same as the pistons: if you're going to swap the stockers for anything, why not throw a paltry amount of money toward a better piston that also gets you more compression? that's just value for money. and gives you room to upgrade down the line if you feel like it.
I'll definitely take that into consideration. .390 hydraulic roller cam I would at least have to say is better than at least a flat tappet cam.