Here are some pictures of my top loader mounted behind a 289. The clarity may not be great, but that is the best I am able to do as I was freezing my ass off in the barn in sub-zero weather. The braided line you see to the right of the linkage is the fuel line. It is tight, not a lot of room. The aluminum brace for the race seat is right up along the edge of the tunnel enclosure. You may need to loosen the motor mounts to get the proper alignment for the transmission. I had to play a little bit, moving the engine slightly more forward and side-to-side.
Good luck.
Jim