I think its a 317 used in Lincoln's and trucks the call it a y block but i don't think any of the parts interchange with 239 272 292 or 312 if you look at it I am sure you will find it does not have the stacked intake ports like the ford y block if you go on e bay type in y block these show up from time to time as far as I can tell there is no speed equipt. made for these sooo if ya got a boat all ya need is a chain......ted