Thinking about a turbo slant...

No prob.

I've been through every square inch of my brother's 7MGTE Supra, so I'm very familiar with boosted I6 engines, as well as that R154 trans.

Another thing that occurred to me, is that those cars have a narrow band o2 sensor, at the turbo elbow. If you used the turbo elbow from that car, you could leave a stock o2 in it for monitoring AFR on the fly with a small readout. You could even make it look oldschool and use a simple, low volt meter.

I always thought it would be slick to run a boosted carb with a set of needle gauges that monitored oil temp, oil press, boost and air:fuel ratio.

I was considering doing a rear mount twin turbo in my Charger, when I was going to put a 360 in it. I think it would be awesome to make an airbox that looked like an old, day two or Mr. Norm's kind of deal. Keep it all vintage looking and all mechanical.

Those Toyota CT26 turbos are good units. They run about $200 rebuilt with stock impeller blades, which would get you where you wanted to be. They also have a fitting on them for antifreeze, so you would need to run a hard line from it to your system, somewhere. Easy plumbing.

The best way to go about a turbo conversion, IMO, would be to mill the head and block with a stone that has at least an RMS (reflective mirror surface) capability of 60RMS min and use a cometic head gasket, with ARP standard strength studs.

Torque plate hone the cylinders and gap the rings at .030"

As long as you balanced it well and used an intercooler, you could get away with cast, 8:1 pistons on about 12psi. That would give any stock 340 car a hard time. My brother's car is relatively stock with a few junkard mods, like that shimmed wastegate. It weighs 3750, It gets about 26mpg on premium and hits the traps up at Bandimere Speedway (5800ft) at 14.15 @ 104mph. Once that car hits the 1000ft, it is GONE.