[Retro]

I will have to measure them up and see what will fit, yes I realize the exhaust will have to be considered as well.
I dont see any reason why the coolant lines couldnt be tied together, a chance of a leaking hose to me isnt a good enough reason, that can happen on either end. Its the same coolant in both engines so i dont think a heat exchanger is nessesary either. I will valve the system and have a switch for the pump. The fan for the big rad is hydraulic and runs off the power steering pump.
On hot days I will have the extra cooling when its colder I will have the extra heat.