No trouble starting, or at idle, but just won't generate the power it had, even before rebuild. It seems almost certainly a fuel pump problem. I mean, it's timed pretty close, and there's practically no smoke, but it seems fuel starved. I'm going to have a pump pro go over everything, but my question is this: should I continue to break in the engine, or wait until the fuel is dialed in. If running it now on a wonky fuel system will cause long term damage due to a crummy break-in, I'll park it for now, as the fuel guru is off til August.