Your build should produce a good amount of torque. Even with that being said, do you plan to hot rod the car at all? If so, I would suggest using the frame ties. I do not plan to use connectors on my car but I am not designing it to be a hot rod, just 300hp, not sure how much of that will make it to the rear wheels.
I am guessing your engine will produce 425-500hp, with the trans and rear set-up, plenty of torque should be there if you choose to utilize it. The Trans Am Nationals will will probably count them against you, they did for me, but the connectors are for integrity and not factory appearance.
The connectors can be the key to making sure your car holds up long after the restoration.
1967 RA convertible 1968 H.O. coupe - sold 1976 Trans Am - sold 1985 Trans Am - sold