Many thanks to all for the help & info & commentary.
Generally the Stock setup, is not up to Muster in today's motoring world.
The Alternator & halogens, is workable, but while do like & strive for an stock setup in my car, I like being able to see and be seen, to stay alive is more important.
My compromise goes.. if I get LED headlights, I can go back to the meager/marginal output of a stock Ford Generator. ( AKA run for hours on the battery )
The LED bulbs that Ian mentions, from the UK web page listed above, hold promise of good results.
http://www.dynamoregulatorconversions.com/
I put in a inquiry to the company, if what the offer would fit a Model A setup.
Looks like they handle low/high beam too.
I'll update the post with my findings.