Just my 2-cents, but I've never lost a flat tappet cam......

Run the pump with a drill on a priming rod while you rotate the crank a few times by hand (need a buddy for this). Make sure you've got pressure at the guage, and you're getting oil to all rockers. Should be able to button it up at that point, and start it. As soon as you get it running, get the idle up around 2k, and let it run there for a few minutes. watch the temp guage. If it runs past normal operating temp, back some timing out, or fatten it up a little and see where that gets you in regards to temp. IMO: Carb should be jetted OTB for this process.

New motors smell funny! good luck.