I inherited a 1967 fastback from my dad and a 1928 model a from my great grandfather. the model a is almost all original and the fastback is gonna be getting a 347 stroker with tko 500 behind it. I'm also looking for a 9" to put in the back. my only problem is that I don't really know what to do about stiffening the unibody. I don't have the budget to buy a whole chassis and stiffeners are still super expensive. I'm definitely not a good enough welder to do it on my own. I was wondering if anyone had an idea that I haven't thought of. I also had an idea to do kinda like a roll cage but not fully. Just run pipes through the body connecting to major things like the front frame rails and rear frame rails

 

Subframe connectors would help, there are plenty of companies that make them for a few hundred dollars.