I hate machine shops..

I read many mixed messages here. The OP says "they warped my housing", but sounds like he assumes they did something to distort it. Others say they often come from the factory out of perfect alignment. Aren't we talking about a cast iron housing? I think cast iron will crack before it yields much, so doubt one could warp it with mechanical force. It will shift slightly over time and from heat, which is why race builders prefer to start with a "seasoned" block. The OP later suggests maybe their "your housing is warped" line was an attempt to up-sell. I would question them "what could make it warp?" and "what are the tolerances on bearing locations and does it meet them?" (as others suggest). If it seems they were giving a line, find another shop.

Re machine shops in general. One post justifies the high cost because they are highly skilled professionals. Another relates how one didn't install cam bearings correctly - ASSumed "same as a Chevy". Wouldn't any competent auto machine shop have a manual for most domestic engines and read it step by step? Any competent machinist should see the holes in the cam bearings and wonder if they should align with holes in the block.

My early experience was taking a pair of heads for a rebuild and not knowing to remove the rocker arms. The shop returned them with the rocker arms loose in a box and parts missing (had to visit a junkyard). I also found years later that the "hardened valve seats" I had them install were regular steel. Since then I do everything I can myself and ask many questions. If they don't like pointed questions, they aren't proud of their work and I walk.