That should work but water weighs 8.3 pounds per gallon. You would have to carry 20-30 pounds of water unless you boxed and sumped the tank. I did use a VW radiator. Now I converted to a 3 gallon plastic fuel cell on the back seat. I carry less than 16 lbs of ice water. Even if I don't use ice the water stays below 120F and I push a lot of air through it.
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89 LX. 363, single turbo, Super Vic EFI, TFS high port heads by TEA, solid roller, glide. Holley HP EFI. (exact combo varies)