This is just my personal opinion and I don't mean any disrespect to the other options out there, but if I had a Chevy II that I didn't mind cutting up. The AME Max G would be my choice. That being said, it would be out of my current budget for a project. I like the fact that you can call them up and discuss the wheel and tire package and ride height that you want and they will design the chassis for that specific setup. Caveat #2 - The Max G will take a lot more fabrication work, so depending on your capabilities etc. that will weigh in on your decision.
This is a complete custom tube frame built by Ironworks for an early body Chevy II, but you can pretend that you would have the complete frame and skip ahead to the other required work. Taking a look at this build might give you a feel for the amount of fab work required to the body.
https://lateral-g.net/forums/show...&highlight=max
As Paul said, if you would still consider a front clip - the Alston setup would be a good option. Their G-bar would also be a good option for the rear (it is a coilover verson of AirRide's Air Bar). It sounds like you are leaning toward the full frame though - just thought I'd toss these out there.
Just a side bar - you've gotta a love the fact that there are enough great products out there that the decisions are this hard. I'm not very old, but I can remember when you didn't have very many options at all - especially on Chevy II's
Good luck with the choice. I'd call both Schwartz and Art Morisson and talk to them. It may help you with your decision.