Help convince me to go BB in my Duster?

If 200lbs will break your car you have bigger issues than what engine will go in it. That's less than having me a passenger with you.

I don't know man, myself and all my friends are pretty lanky/lightweight..

But in all seriousness, I know for a fact it all has at least surface rust. The torsionbars are coated (but those would get replaced anyways).

I have about a foot wide hole that needs patched in the trunk on the passenger wheel well. The whole car seems pretty sturdy though. I'm going to be pulling carpet and things on friday to look for floor pan issues.

If no rot, the plan is to sand off all the rust on the frame and coat it in some rust reducer/preventer, if rot, I need to figure out if I need to find a welder friend who can make housecalls or something, and get it patched.