FWIW rockauto hooked up my POS for about $80; picked up one with the auto trans cooler (to run my engine oil) for my 84 and it worked awesome! Now it lives in another member's ridiculously built 84 4Runner. Plastic tanks be damned! Oh, I also stuck in a 180* t-stat and that helped a bunch. Next build I have an F250 radiator (3-row w/trans cooler again) to use. I am not afraid to cut-to-fit anything.
>>Dan