Torque boxes and frame connectors. When are they required?

Hey 126. Your smart enough to ask good questions because you obviously care and want to do it right. Here's some info for ya. Torque boxes and frome connectors are not necessary BUT, if your intent is to put the power you say you have to the ground and not tear up the car by major flexing issues then YES it is necessary. I fabricate all of mine here in the shop. Anyone with a brain and tools can do it. Ya cant be lazy and impatient but you dont strike me as being that type so that's not an issue. I build mine and you dont need to cut the floor. Mine are the weld in type. I've got a B body on the rotissire in the next room and i'll try and get you a pic. On the drive shaft and u joint issue. Here again to do it right with that kind of HP so you dont have to wonder if it's gona hold up this is what i did and i continue to do. I replace all u joints with the 1350 style, front and rear then have a drive shaft built to fill the bill. No question whether or not it will hold up. Done deal. Did i mention the Eaton Tru Trak gear drive sure grip 3.91 in the 8.75 rear? You may also want to invest in areal set of aftermarket axles.
Small Block