You may want to try Advanced Adaptors. I think it will be cheaper than the current P-car vendors. It uses a 429/460 transmission adaptor for the Ford small block transmissions (ala ZF!). I was going to do what you are doing and attempted to carve out an old C-6 tranny for the bellhousing. There were too many fitment and dimensional issues to continue. FYI! Cal #2428
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