you realize there aren't very many good HIGH HP sequential turbo systems around. No one bothers with them, especially on race cars. Streetcars, iono, but tech usually get's R&D'd for racing use

 

If I had the money, I'd already have a blown 514 in my bronco. Being that it's a truck, I would definantley benefit from the torque. Can you make the same power with either? Hell yeah you can. Power is only limited by your checkbook. Anything can be done with money in pocket.
The question is, which blocks are you debating, and what is the final motor goin in? You also have to consider the mileage on these motors. (I'm assuming that they are both used) Some blocks can't handle a lot of power either. For example, a Ford 302 with a two bolt main is nowhere as strong as the 302 with a 4 bolt main.

Just give us some more info, and be as specific as you can.

 

I see now that you said either block will be aftermarket. Still need to know which blocks you are considering.

 

well people don't usually run around town with 1200 hp, 60 psi F1 engines, but they DO run around with 1125 hp, 14 psi Ultimate C5 Corvettes