So is the timing setup? That could explain the bad idle. Fire order? Vacuum hose connected from carb to distributor? Give a bit of understanding to the fact you have a ground cam so there might be some lump there.

You need to take your time and go over it slowly to check everything. If it got hot quick then there is a chance the coolant isn't circulating properly, check the water pump isn't cavitating. And check all pipes are clear not kinked.

Rezlo had an issue with his engine temperature sensor - it was meant for a different voltage or something and it was giving a faulty reading. Is this a possibility with yours?

As for the oil try your best not to push it. I did with an engine and the results were catastrophic - (spun a bearing - gouged crank journal). Check the level.

You might want to consider checking the pump, then the oil pickup and then if that is all clear you should check the oil galleys.

I can't give an answer on how soon you should see oil but looking at the layout of the pump they should work within seconds. Whatever you do do not push it, the amount of wear that goes on in an engine that isn't oiling properly is enormous.

I know there are some pretty basic questions there but sometimes people forget things when they are firing their new engines.