FOUND ON EBAY!! not mine!
ULTRA RARE 1966-69 Corvair Powerglide to SBC KEP Bellhousing Adapter
https://rover.ebay.com/rover/0/0/0?mpre ... 3217943783
RARE 1966-69 Corvair 3 or 4 Speed to SBC Mid Engineering Bellhousing Adapter
https://rover.ebay.com/rover/0/0/0?mpre ... 3217935013