Nice. Way to think out of the box.
Most aluminum aftermarket radiators fit poorly to the radiator core opening and give up precious room between the radiator and fan. They also don’t seal to the core support and air bleeds off wasted.
So with that radiator, will a 73-76 26” A-body fan shroud bolt and seal right up?
Just reference: Reseda Radiator did 4 core high density core (more fins/in, tighter tubes) for $450 in 2011. He had to supply tanks and sides. Cools a 472 cross ram Hemi with no shroud fine.