Spirit started life with the 300 I-6. But it was getting tired and I wanted more power, so I opted to put in a 302.
I made "homemade" sidepipes if you will for her exhaust. Got everything I needed from my local parts house & welded it at home. And they sound fantastic!
Took out the backseat and spair tire and tire carier, took out the two captians chairs up front and put in a bench seat up front for better power to weight ratio and accleration and breaking.