I run Mobil 1 Synthetic 20W50 in all of my motors. I use a 10W30 for the intial run in on the engine, then change the oil to another load of 10W30 for the first 2500 miles then switch the engine over to the Mobil Snthetic. I use the Napa Gold filters (made by Wix) and have never had any problems with them.

By the way, that is a very nice looking '57 you have there !!! Congrats on a job well done !!!!!