well first off.....why are you changin the core support...is it wrecked or what...........i swaped my 98 v6 for a 302 and then you just use a 4.6 radiator or what i did and just cut the mount tabs off and weld them slightly closer till they are right and weld em back on........or you could even bolt them if you had 2 pieces of long plate metal............im pretty sure that they are welded up all around........on trucks and vans and some cars they bolt on the top and weld at the bottom........but im almost positive ours are fully welded...........but like i said whats your reason for new one.........really???