fal .... I just pulled-down a set of 906 heads for a guy who paid for a lot of work .. that some of it was simply NOT DONE. Specifically ... he paid for bronze guides ...and there was no guide work at all. There appeared to be some seat and valve grinding .. but with loose guides .... that work is basically a waste.

I would be sceptical here. New(and larger) valves, seats, guides and retainers ? ... that would not be all that hard to confirm.