Parts swap on industrial 318

Thanks for the replies, it’s much appreciated. We did just verify the headers we have will fit the current heads, still unsure if they will fit in the car though. It has that torsion bar suspension that may be in the way. One issue we are having is the piston rings collapsed from sitting so long and won’t come off 2 of them. We soaked them in atf and currently have them soaking in a parts washer. If we need to replace those pistons, how would I go about getting new ones? Places I have checked only list pistons for regular 318’s that have valve reliefs in them.