I pull our 3200lb trailer with no problems. The only complaint I have are all of the tow mirrors I have tried vibrate too much so it's hard to see when I make lane changes. Other than that I don't have any complaints.
Nice find. Makes me miss my 67 & 69. At least power brakes were added. It doesn't look like you have power steering on it. If your interested in the bracket and gearbox pm me. I still have a few boxes of stuff from mine. Here's a picture of when my jeep decided it wanted to go over the side of...
Here's the fender during cutting.
And here's one after
I haven't fully flexed it yet. Going to try this weekend though.
Before I cut the fender I put the tires on and just lifting the one side it came close enough to rubbing that I decided to just cut it.
I just installed the EVO leveling kit over the weekend. I only used the front coils on mine. My rear springs are 60's and with my bumpers it sits level as of now. I'm also running Nitto 35x12.5 on the stock rims with spidertrax 1.5" spacers.