I once knew a guy that completely hacked up an 89 Mustang with the intent of adding 1968 body parts to the front, and rear of that car. His thought process was that it was a “ factory 4 banger, gutless POS”.
The negative pushback he received from changing the bodywork was just about 2 out of 3.
And it wasn’t anything special......like a 79 pace car is.
If this is a Recaro seat, True 1979 Pace car, think twice about gutting it and hacking in sht from the donor car. If you put “ what you want” in one hand, and balance “ what you have” in the other, the 79 PC, restored to a resto-mod level will be a far better end result. A Resto-mod, where you change out the “ gutless 302” with a power-added HCI rebuild, trans, brakes, rear and
suspension upgrade(s) while keeping the interior and exterior true to stock will do way more for that car, ( and your future resale) than the path to pieces-part bump steer town you’re currently planning.