Thanks for your help guys. I have sent my info to Alston for their advise and a quote.
I know there is more to do to get the chassis to certify for 7.50 the underfloor additions and crossmembers would have to be fabricated to fit my car and chassis configuration but the prebent cage portion will be a step in the right direction.
When I'm not racing I do tech inspections at my home track and have been a SFI Certified tech inspector since 1990.