Love the ideas, is this going to be a street driver or ? race speed air is not the same as street speed air.
If street=but just from having done rear rads a few times in the passed,there very hard to get to work,real good air flow is the big prob,both in and out,it's a ton EZer to put it up front of front wheels or very close for flow,also water flow needs to be set up with bleed points at all high points if rear motor with front rad,but that much EZer to deel with the poor air flow at rear. No matter how well scoops are made,air flow passed the front wheels gets bad and just dose not flow into scoops like you would think should happen,so bigger and bigger rads are often seen on rear rad designs or in some cases moved to front.
Mostly if a rear rad was designed to start with,few builders will admit a screw up after the fact,I see that a lot in hotrods they built to look like drag cars but tryed to drive on the street and over heat,so insted of fixing it,they sell it off or only take short trips.
Being now 70 my self,I played this game,and just pass along some info for your better planing.