Just a few things you might know already but here goes, 1 wires are fine but there are things to know going in. When buying it will need to fit the small block Chevy and brackets you have, and then have to split and re clock when you change over to the Poncho engine. If you have a warning light in the dash it won't work and you will need to get a separate volt gauge. If I remember correctly they don't charge at Idle if that matters to you.
I do know that I'll be running 2 separate bracket systems on the motors, and your note on re-clocking the Alt is greatly appreciated. Charging at idle is a little concerning at least in the beginning phases of shaking the car down, I can imagine I'll be doing a lot of short trips and idling.
Is there an alternator that charges at idle and puts out reasonable amperage for some modern touches? I know I'm not demanding a ton with what I have planned but maybe adding A/C in the later phases of the build would be a consideration.