The tranny cooler is an original idea for sure 
But I would just try and do a clean install on the heater core. Use some steel braided hose or something to make it look good.
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92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim.
00' Lightning-Stock
88'CRX-13 second ego killer
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