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These are fun questions you have regarding the suspension and brakes. Were I you, I would go with the larger fronts and outboard rears via the ERA upgraded suspension.

That said, my #375 is pure stock as of its 1992 vintage with the inboard rear brakes and standard front. I have never tested the newer ERAs with the newer and larger brakes. It would be interesting to have someone who has a good amount of time behind the wheel on an ERA with the standard setup as well as the newer larger brake setup give us some feedback as to the actual differences that manifest.

Now for the tires... I am running BF Goodrich TA Euros on both the front and rear. Goodrich has not been making these for some time now. They are H speed rated and they have NO SNIPING which means that the outer lugs are not slitted. The lack of sniping or slits means that they do not pick up tiny pebbles and fling them back at the exhaust and rear wheel cover.

I just picked up a second set of brand new (with the nibs and stickers on the treads) TA Euros for the rear in size 305/50-15. These came from a guy in Vancouver BC, Canada who had them in storage for his Camaro project. So now I have a second set for the rear end. If you watch EBAY you may be able to find a set. The side walls on the Euro TA are essentially smooth with the exception of the raised BF Goodrich T/A letters which are in black. The smooth side walls make for a nice clean look and they detail well. The Yokohamas mentioned, are not to my taste from a visual perspective. The sidewalls are rather busy on them as I recall. My original set of Euros, which is still on the car, has worn very very well and has about 18,000 miles on them with 3/4+ of the tread left. They are near perfect in balance and roundness as verified on the latest Hunter tire and wheel machine.
Needless to say I do not "burn" the rear tires alot. Just a few "chirps" here and there... hee hee

I would be wary of drag radial meats in the wet or on sandy roads, especially in fast curves. What rear end ratio are you going to run? I have the 3.31 rear end which does limit wheel spin and give a lower RPM at higher speed.

Good luck with the car... What state will it live in BTW?