Last summer i did a cheap rebuild on a 350. not much performance holley intake, edelbrock carb, and summit low end cam. my question is my bearings went bad right away, my rod bearings where kinda black and had little chunks out of them and the main bearings had a record disc feel and look to it. Is this an oil pump issue? because i never replaced my oil pump with a new one. and could this happen from not using assembly lube?