I've recently had the head machined, and just about to reinstall the head but before I do wanted to check on a couple of things.

I dropped the oil before removing the head (probably not needed in hindsight), and so I'm conscious of potential issues with getting oil pressure thru the pump. Do I need to anything specific to prime the oil pump? I have seen recommendations to crank without the spark plugs for 30/40 seconds until pressure shows on the gauge.

Also, should I pour a tablespoon or so of oil into the chamber before reinstalling the head to give the rings some initial lubrication?

No forget the oil pump, unless it's been standing for a year or more. Just crank it with plugs out until you get pressure.
You can put a spot of oil in first, won't hurt, but not necessary.

Retighten the head and adjust the valves when hot.
I would repeat after 500-1000 miles.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Thanks DrMini. Really appreciate it.. just wanting to do things right first time