For all the ricer joking and mod idiocy of the Civics, they are structurally tanks. I've seen alot of them turned into sturdy "hoppers".
Your weight? You'll have to show me a 383 on a go kart before I'd even begin to believe it Dakota. Somehow I just cant see tubing holding up to 400+ pounds of torque. let alone your beefy structure. All I can envision is a great FAIL demotivational poster. Friend had one with a 450 Suzuki on it. It held but bent in all kinds of ways. Trip to drive , fast enough to shake the frontend to the point of scaring you to let go of the throttle.
Oh im not saying im planning to do it im just saying itd be a sight...It would be very entertaining but not something i have the paitince nor do i see worth the effort and time to build...Besides i think itd be more fun to pick up another camaro shell and drop it in or just hold onto it and put it in a truck or somethin