'71 Cheyenne

[Shon]

I got a 71 Cheyenne, been in the wife's family from the day is was bought new, got the sales papers on it.
Anyway, I want to see what I can do to get this thing to haul my car and trailer. (97Z28 and open trailer.)
It has the original 350/quadrajet with 105k miles on it. I have replaced the radiator and water pump and hoses. Had the trans rebuilt and the half shaft bearing replaced. It needs the heater core swapped out, which I got, just got to do it.

With all that, what will it take suspension wise to get this thing to tow the car and trailer and what kind of motor mods might I need. I have plans to pull the motor anyway, it is leaking pretty bad and the gaskets need replacing, but if I got it out, thinking I might need a little more grunt to haul with it.

it has 3.73s.

I have tossed around the idea of puttin an LT1 based motor in the thing since I am familiar with that motor and tuning of it...

What is the consensus here?