My 1988 5.7 Block has the thread bosses and holes for the Roller Hardware but came with a Flat Tappet Camshaft . If your going with a roller Cam now then you should be ok with the springs that are on them heads . Best to take one off and check it's Lbs at install height .

As for them Block Casting #s . Call the Engine Shop up they can tell you . But should not make a big difference they have 5.0 or 5.7 right on them .

Sorry if you did not care for the Fighting . But I am sure being a U.S.Marine you know the need to stand up when you have to