I have an adapter plate (GM Part#3836601) that fits between a Chevy 6 cylinder with a powerglide transmission. Internet search shows it fits 55-57 Corvettes and other 1950-1957 models. Excellent condition with only surface rust and no visible cracks. $200.00 (Shipping not included). E mail me at pattons55@yahoo.com for my cell number and pictures. Thanks JP