Welcome to the site.
In regards to your need for a chassis, an internet search should provide you with several manufacturers of a new chassis for your car that will accomodate new suspension, etc. Just look up "hotrod parts" or "hotrod chassis" ...most of the sites that come up cater to Ford fans.
I have found out that if you want to build a Ford rod, the parts are out there. If you want to build the old GM cars parts are more scarce.
Best of luck with the chassis and enjoy the site.