After more cleaning, looking, measuring, and some good old math I believe I have a 1963 model 390. I know casting numbers can't tell ya what it is but they are accurate on when it was built right? It seems to have 1961 heads on it. The exhaust manifolds seem to have been designed for a 63 T-Bird. Now for the trans, casting number says 61. on the other side is a tag that I assume is a date code says jan. 30, 63 is that normal. And what were the tranny options for those years? It is an auto matic