What you have to keep in mind is that we are all here to help each other. And we honestly are trying to you. You give us parameters that are clearly outside the known livability limits of the 4l60 (which is barely adequate for non-towing light duty use-and there are some who wouldnt even go that far) and then you ignore the advice and say youre going to do it anyway. I havent read any other posts you have put up with this same question, but I bet youre getting the same answer in those other places too. Im sorry, but it is what it is, and its going to be what it is going to be. And youre going to have to get used to people losing patience with you if you continue to ignore what they tell you. Just because you want a certain answer doesnt mean that its the right one-or that you'll get one that you like.

As far as whether anyone can build a '60 to live behind your engine, and in front of your load, the answer is yes. But the catch is, for how long. '60s can be built to take a lot of horsepower in a light car and do the 1/4 mile repeatedly, but towing 25,000lbs+ up a mountain or even a long 2% grade is going to fry it. It'll be fine around town but dont get too far away from home, or its going to be a long walk.