I put a cleveland in my '81 F100, that was originally a 302 truck. It sat in with no modifications except for pulleys and accessary brackets. I used Blackjack long tube headers made for a Ford pickup. I don't know if they are still available or not. So like someone above mentioned, find the mounts for a 302. If I remember correctly most of those earlier Pcups had the same frame mount locations. They came with L6's all the way to 460's and transmissions of different sizes. It's a piece of cake. Wish I still owned that truck. That cleveland sure made a world of difference in every aspect of performance. If its a F100, I would upgrade the brakes to the larger F150.