What is the towing capacity of a '75 Camaro with the same equipment, AND what does the truck weigh relative to the '75 Camaro. If the truck weighs more than the Camaro (it may not) I'd reduce the towing capacity by that weight.
My bet is it will be real slow with a load, and unless the trailer has its own brakes anything over a 1,000 pounds may be hard to stop.
My '55 1st GMC Suburban has a GMC 270, SM 420 4-speed, and 3.08 rear gears. The brakes at all four corners, and the rear axle, are from a '73 Chevelle. I've towed my tandem axle car trailer with it, but was not impressed by its ability to move the trailer empty, and could really feel the added load when it came time to stop. I was so impressed I cut the welded on received hitch off my Suburban shortly afterward.
