I just finished a rebuild on my 57 235 (Valve job, rings and inserts). I have the engine all back together and started it for the first time. It started well, good oil pressure and oil is flowing well to the rocker arms, but I can't get it to run without the choke fully closed. When I open the choke it dies. What gives? Is it a vacuum leak? The timing is ok. I had the valve job done by a good machine shop and adjusted the valves just for starting purposes, knowing that I need to adjust them again once the engine is hot. Anyone have any ideas. Three months without driving my truck is too long, can anyone help me?