Rear mounted radiator ???

[Wally]

Jim,
I don't have the exact info you are looking for, but like to tell you about a wbx engine that I've seen that has been using a radiator in the engine compartment without removing the firewall! He had used a porsche fan set-up to pull (or was it push?) the air through the radiator, using a special made housing to duct the fan to the radiator! It made a very special whine whem revved. Very cool! It worked/cooled great for him.
Just a thought.
Good luck,
Walter