For an affordable upgrade, you might look for a 74' 260Z radiator, they run about 130 bucks and are about 3 times as thick. They require you make new brackets, but for the price you really cant beat them. Also, the outlet routing has to be redone, but it's not too difficult. They are 2 5/8 inch thick, 3 core. The 240 radiator is only 5/8 thick, with a single core

I dunno how important it'd be for you, but man...the price is right! I'm about to order one myself
