Hi Robert, nice to see you here!
Someone once described to me using an HEI from a Chevy six by comparing to the stock distributor, and machining to match. I couldn't get much more detail than that.
I've also been told that Chevy and GMC distributors are inter-changeable, but I've not tried to confirm it.
I'd like to upgrade my 270 to HEI, but haven't wanted to bite off that project. If you do it, take pictures and share them.
