spend the money on some 2600 conti-tech 4 plys, make sure you use braided line in the front, my 69 will melt that shit in the engine bay if its not braided, or sleeved with anything heat resistent. go with some 1/2 inch parkers, and 1/2 inch setup, 2 tanks and an engine driven, its kind of an elaborate setup but you will be glad you did, the caddys are so big thaey take a lot more psi and air to get em up, plus make sure you go with good parts because you dont want a 5000lb car doing anything funny at 60mph. you know? good luck email me if you have any questions or need help with gettin the parts.
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