I went to pick up a "1950 Ford 750 Big Job" truck for a project to play with. I was told it had a flathead engine in it and that it was original. Ends up I paid a hundred bucks for a 1956 Ford F750 Big Job semi with a Y block in it. What the heck...it looks like fun! Anyone have any idea if these trucks had the 312 or the 292? I'm guessing it's the 312 being that it's a 750. I suppose that there is a number on the block somewhere that would indicate what it is. It runs well, but being unfamiliar with Y blocks I may be posting some tardish questions on here so please don't laugh too hard. Anyone know where a person can pick up a repair manual for these trucks? Checked ebay and mostly found f1-f4 stuff. thanks in advance! David