Has anyone tried the Borgeson PS Box??

The car is far from built. I'd probably run try-y's just for fit and availability, but the concept is factory-stock looking so if manifolds that make decent power exist....
Ok. The things I’ve seen that can cause fit problems in BB A’s are usually large tube headers, over 2” and conversion mounts that may alter the placement of the engine.
It’s tight regardless. The try Ys are very close to the manifolds in terms of real estate. That is your best bet.