Congrats on the purchase..looks a nice car....
On the subject of oil pressure..
...a wise old engine designer once told me that oil pressure is not all its made out to be when it comes to engines. The main function of oil is NOT to lubricate but to remove heat. There are several tonnes of pressure on a crank when a V8 is on song and you can imagine the heat that produces. Rover V8's I recall are fine on very low pressure...
Here endeth the lesson....