Update,
I pulled the distributor and all looked ok, I turned the oil pump with a drill in reverse and the oil pressure gauge showed good OP. So put the distributor back in and turned the engine over with the plugs out and again good OP. Put it all back together and it has maintained Op still not been able to drive the car but got it well warmed up on the drive and OP stayed at about 40psi at idle. I have since changed the filter and oil and hope all will stay good.
One other issue I have is when I turn the engine off I get an air hissing noise for about 10 seconds, it seems to be coming from the back of the block low down around the cranks seal. Any ideas what this could be ?
Thanks
Mark.