Outer Limits 4x4 Board

im looking at mounting a aluminium radiator (which i already have) to the rear of my tray.
im running a 350 chev with a aluminium edelbrock water pump to the original 40 series radiator which runs a bit hot.
has anybody done this that can give any tips on what tubing to run to the tray which thermo fans would be best and if the water pump would push that far?

also what temp would i expect it to run at, it currently runs around the 90-92 degrees and 4wden up to 95.

I'd be making sure that the standard one you have is OK first (clean) . Rear mount is fine for a comp car or speedway, but it makes it very vunerable if you ever put anything in the back with it.
If you have to, just use exhaust tubing and get the exhaust shop to bend it up so there is no hose joins underneath.
You will probably get more cooling effect from the extra volume of coolant more than radiator placement. Another option may be to put a heater core behind the side vents , and run it full flow in the heater circuit tee'd off.