Good help csf03716 The adaptor plate in my 327 chevy has only 2 pieces of ID. GM2 and 3836782 I looked for any info on casting numbers but came up with nothing. The #s are clear and I am sure they're correct. Both block and adaptor have top center bolt for tranny. The 700r4 and the th350 dont. the rest of the bolts though seem to match. I am leaning towards a th350 because length matches the powerglide. I attached pics. Thanks, Homer