68 GTO...BACKHALF OR NOT? dilemma

[DM03]

Hey all, well yesterday i brought in my bare chassis to have boxed and cross-braced. After telling the fabricator what i was looking for(strength in the chassis for handling the motor, handling). I plan on running the Moser 12bolt, because ive heard the 10 bolt just wont hang. He called me a few hours later and said two options, The first being exactly what we talked about-cross-bracing, custom cross member, boxed frame, and running that 12 bolt with some hefty aftermarket uppers and lowers with coilovers. For that $2900 for just the metal work on the chassis (not including 12 bolt, arms or springs) or Completely Back Half the frame, mini tub it so i can run 315's or 335's, box and crossbrace like before, and fab up and 1 off 4 link system. Without the rearend, the price is $4900. Im not really sure where to go guys. I would love to fit some wider tires and have the rear suspension bullet proof, but at the same time its a lot to bite off. If you understand what i mean. The cars intention is to be a no BS street brawller, and will probably see the track here and there. Im just looking for your guys experience and knowledge. I realize im probably leaving a lot out, but im really kinda stuck here. Thanks for the help-Daniel