3.1=slow, slow, sssllllooooowwwwwww......
I know you're determined on getting another Bonnie, but this might just be a good home for your old motor? Don't know about wiring differences, though.

3.1 wouldn't be a GS, either, might be LS

I'm not really looking for a fast car. But if I really wanted to I could swap the 3400 top end on there to get somewhere in the 180 hp range?
But yeah not really looking for a fast car right now because of $ reasons.

Well here'* my highly valued opinion (yes I'm bullshitting myself)

I would say to get the Regal, sure it has the 3.1 no biggie, as you said you're not looking for a fast car, just a car to drive around. The Regal sounds 100x better than that POS *-10. and it'* even cheaper too. I would say to get the Regal and paint it yourself and if you MUST have a 3.8, just go to the junkyard and pull a S1 L67 (rare yes but could be lucky) and swap it in and you're set and all for less $$$$$$$ than that *-10. Whatcha u think Mike?

3.1 has some serious pep from what i remember

I think the ser1 L67 would be alot of work. I'm pretty sure they never got anything outside of a L27 and I think it just has a 4t60 (no e). Plus it would take alot of down time. But if I had the time, $, and drive, it would probably be a fun car.
I'm really trying not to put a bunch of $ into another car either. I'm just looking to get 5 months or so out of it.
I might just ask the guy how much for a quicky paint job or flat black lacquer primer.
But thats all if it runs ok.
It sucks cause 40hrs working + night school + physical therapy is eating all my getting back into a car time.

Ah, yes, I forgot that. My grandpa has a almost mint Regal Custom with the 3.1. It was definitely peppy but not as peppy as the 3.8 but close.

So I'm going to emphasize on the Regal big time, I'm sure you could find a newer Regal for a couple hundred more but otherwise that Regal you're looking at sounds like a hell of a steal.

Get the Regal. That'* $100 saved that you can put into the next Bonneville. Plus, it sounds like it'* in better shape.

is the s10 2wd?

Yup