Ha ha ha, sorry I'm no help. I couldn't recall exactly what the deal was but a long time ago when they were more plentiful we used to modify (move the lower outlet) and swap Gen 1 4 cylinder radiators into the Gen 2's. They didn't just fit, re drill the bottom holes and make a bracket to hold the top IIRC. So doing it the other way might just be drilling 2 new lower holes. I know one of our local guys swapped one into his 89' SWB, he's not super tech savvy or a fabricator so if he figured it out you should have no problem (mind you he has a 2" body lift) but it has been done before.