My rebuilt small block chevy has blue smoke on start up,runs fine.?

Us Mopar guys aren't too fond of Chevys but we do on occasion use Chevy transmissions and Ford rear ends, disc brakes and other parts from other manufacturers in order not to break our piggy bank. oink oink.....
yeah I dont get it why some of us (not me) use turbo 350's or turbo 400's when I think most agree the 727 or 904 for that matter can't be beat, or is it strictly a money thing??