Hey guys getting ready to start the chassis build up in preparations for getting the big block back next week. And I have a basic idea on what i want to do, which is get 2"x3" .120 tubing for a set of subframe connectors and .120-.125 plate for making my own torque boxes. bigger question is could I use 1 5/8"-1 3/4" .120-.125 round tubing instead ? Which would be better, and by better I mean less affected by the twist of a big block with hard poly mounts (schumacher slant to BB swap mounts), I will be using a engine limiter, not sure if it will be a chain or solid rod, leaning more for the chain. any and all inputs are welcome. I also have to replace the front frame rails because of rot, have a nice set I clipped off behind the trans mount of a '88 5th ave, but was wondering if the 2"x3"x.120" would work for a set of front frame rails and be more rigid due to thickness than the stock factory setup,

Thanks,
-Mike