I installed new 280z radiator that has two oil cooleror transmission oil coolder inlet and outlet.

So,,,

I popped up the idea that if I install the "perma-cool oil filter relacatiion kit and its hose/s which connect to the 280z radiator's trans oil cooler inlet and outlet, it would good idea? So, I don't have to buy an oil cooler and finding/driling from engne or oil pan?

any thoght?

just like my 240z, I am from japan too, what's heck

The trans cooler in the radiator wouldn't have passages that would flow the engine oil, as it is designed for a light viscosity oil such as transmission fluid. Not only that, but the oil pressure would almost certainly cause problems as the radiator isn't designed for that high a pressure with such a heavy oil.

Better to get a relocation kit and do a proper engine oil cooler in front of the radiator.