solo racing an early A

I think my biggest problem is going to be the steering. It seems that my only options are the Flaming River manual box, or the Borgeson power box. Im simply not willing to give up my manifolds just yet, and not willing to spend a grand on headers that may or may not fit with my column/shifter linkage setup. Anybody tried the Borgeson box yet? How does it compare in size to the manual box?