I have a 1950 chevy truck that I converted to 4x4 .I installed a rebuilt 1957 high performance 283 . To the best of my knowledge this motor is stock except for a set of new 305 heads that I installed as to have accesory holes and an aluminum intake with cast iron exaust manifolds and a holly 600 cfm carb that is still jetted for the 383 stroker that it came off of . I have yet to tune in this 283 . This little motor pulls my truck through the mud like a freight train . The local dealership can not tell me which version 283 that I have but I do know that there were several versions made ranging from 283 to 312 hp . Can anyone help me to identify which version of the 283 I have ? Please email me at [email protected]