Can a 700r4 safely tow 7 or 8k pounds with some slight modifications?

[eight_kinds_of_hell_454]

79 Chevy 1/2 ton truck, 454 engine (3.08 gears now, shooting for 4.10s which is why i want the 700r4. That and the low 3.06 first gear). If the 700r4 is modified with extra clutches and the corvette converter and servos and whatever else and a large cooler could it handle the 454 and a max of say 7 or 8k pounds? It shouldnt have to do it frequently, this truck is just a backup in case my other truck breaks down. Id rather not have the expense of a 4L80E and standalone controller.