The wriggly experts claim you only have to adjust regulator only as the dynamo will put out enough voltage. Starter fine, I always think a fuel pump with priming handle to be essential unless very regularly started, especially if cranking over original 6v starter on 12v just tho get petrol up.
Lazy way and also probably better reliability is an alternator kit, I have one of the side-splitting Mr. J's waiting to go on a jeep. By the time I've begged a freebie scrap alternator (Landrover ones are right pattern for GMC) and exchanged it as core unit for a rebuild from local auto electrical factor and sorted pulley, it's cheaper and simpler to order a full kit.
I'm hearing very mixed reviews of electronic ignition kit reliability which gives me cause to consider retaining the old points system (I guess I'd need another condenser or will they do either voltage?) - don't know which way to go now as I have an electronic kit here ready.......