318 hard start when hot

I've never had a problem getting a wrench on the starter bolts on a full size Dodge truck. 87-96 Dakota's not so bad , I only have had problems getting to that bolt on 318/360 Durango's for some reason. Fortunately I haven't had to do so as much on those as the older ones.
I had an 89 diplomat that I had to replace the trans on, and I got the bolts out of the starter fine but that thing had the starter "grow" to the trans. I had to way-lay on that one with a sledge to break it free. I ended up having to replace the starter because of that one that trans job
I put the old starter back in but it didn't work after having to be pummeled on to get out.
I started with watching a few videos where a guy used a 5/8 and a 6 inch extension, wasn't physically possible. kept running into the manifold, just wasn't enough room in there. I can get on there with a bunch of extensions and I have to use a swivel to get my ratchet on it, but wasn't able to turn it, ended up sticking the impact on it and still nothing. So I put the torch on it and then went back to ratchet and no luck, so I used the impact, and still it won't move at all. Again I have no idea what the shop tried, but they told me they couldn't get it to move either, and suggested cutting it off and I said absolutely not. I'm at a total loss right now as to how to remove this thing. Like I said I can try and finagle my camera down there and get a pic tomorrow, not sure if that'll be any help or not, but I'm just stuck at this point.

I do live in northern michigan, pretty high in the rust belt, but the bottom nut came off like I was turning it with my fingers, absolutely no issue at all.

Maybe if I bash on it with a sledge that might losen up the bolt lol, idk, I am intending on replacing the starter anyway. I kind of doubt that will help, but I suppose it might be worth a try? Although I figured with heat and pb that thing would have broke right lose no problem.....