With regard to the Voltage Regulator - I am still using my Ford 1G (3 Wire) alternator. I took it to one of the local shops (Luna Industries 520.792.3080) in Tucson, and had it rebuilt. It tested at 78A output after the rebuild. The rebuild, which put better "guts" in the stock case cost $92. They replaced bearings, brushes, rotor, rectifier and field coils.
I saw no advantage (really) to converting to a 1 wire alternator, due to the inconvenience of figuring out how to rewire things. I can't remember now, but there was another issue with going to a single wire alternator - maybe it had something to do with the charge / discharge light?
The belt driven accessories are set up like that for the flat firewall cover, and the (future) flatter bulkhead. It won't be 100% flat, but enough to give my wife about 3 more inches of seat adjustment.