Hi Alex,
Well sir, the first I must tell you is what a dynamite color that is and I'm very pleased that you kept it that way. Its a period item that makes your car very distinctive.
JMHO, but I think you are on the right track with everything you've planned and I'd simply add that the key to long-term survival of these magnesium-cased engines is strict control of oil temperature. To that end, you should install the factory optional front oil cooler package, replacing the OEM trombone cooler with a later Carrera radiator-type and fan. This will contain peak oil temps and help prevent head studs from pulling.
Make certain you install a pop-off valve in the airbox to prevent the backfires from cracking the whole thing.
Replace all the rubber suspension bushings, shocks, and perhaps Turbo tie-rods to restore the ride quality & handling.
I hope to see your ride at one of John Walker's swap meets in August.
Hope this helps,