Turbo....

no I can't, on account of I have no experience.
But IMO, I don't think your being fair;
the question I would put forth is this;
Suppose your system was under the hood in the usual place, and NOT running an intercooler. What might be the charge temp?
Now run the plumbing for the intercooler but substitute a 15foot X3inch aluminum tube (or however long your current piping is), in it's place; what might be the new charge temp?
And finally, install the intercooler and generate the final temp.
In your story, you left out the first part, for obvious reasons, I can see that. But what if.

As to turbocharging, I can only parrot what smarter men than me have to say.

As for myself; If I owned an Early-A and got the urge to turbo it, I would try to run a water/meth injection system before I would run an intercooler hung off the front.
But before that, I would for sure at least try a remote, and possibly a 2-stage; that's my dream BTW,lol. Not for mega-power, cuz there is no way to harness that on the street anyway, in a stock-body Early-A, lol. But for two things; 1) the cool factor, and 2) tire shredding torque just off idle.
In my dream, I would run a small turbo under the hood just to get the ball rolling, and feed the exhaust from it, along with an exhaust bypass, out to a bigger turbo out back.
My intercooler(s) would be disguised as LakerPipe(s) sending the charge-air back to the front. Hey, it's my dream,lol.
Relying on water-meth injection sucks, I know, cause if it ever runs low or F's up(& at some point it will) it can ruin a lot of hard work and expensive/irreplaceable parts. Luckily when the piston ring lands collapsed on the turbo'd 340 My Bud was running in the AAR at the time, it didn't destroy the T/A head or block. The injection We were running stopped working around the 1/8mi mark, & that's all she wrote....