Reminds me of when I did a Poorboy installation on my '84 Aspy. I'm not as creative and preferred to buy (overpay) for a tried and true kit. Best thing I ever did to that 1200. I'm glad you commented again on the small coolant hose going from the pump to the thermostat. I was going to ask about that. LTD item only, huh? Wonder why...
Anyway, I'm not sure about your spacing and required fan shroud "modifications", but be conservative. Remove more material than you think you should. Don't ask me how I know. Oddly, the shroud is notched from the factory in exactly the needed spot, just nowhere near as much as needed.
One more thing, if that inboard timing cover bolt access it too troubling (requiring crank bolt removal to pull the cover), consider leaving it out and installing a rubber plug (or nothing) instead. Since I'm constantly dinking around with my '78, having only the two outboard bolts is VERY handy for quick removal when needed.
Unless you're lit up like a Christmas tree, 55 Amp capacity is way more than enough.
Good luck!