I moved to 5/30 Motorcraft oil with Motorcraft oil filters, always. Changed 2,000 to 4,000 miles, not time dependent.
I am in the process of rebuilding mine. Teksid block is in the shop. Rotating assembly ordered. Trilogy going out to Steigemeir.
I blew mine up due to user error. I freely admit it. old fuel, happy day turned expensive! I broke two rods, bent four more and two looked nearly normal. One piston was in three pieces and made quite a mess. No useable parts on that engine from the deck to pan plug.
Anyway, I have the pistons, rods and crank out of that Teksid engine I got out of a 1997 Lincoln Mark VIII. They are available for sale if you need good internals, I am Going all forged in mine. The block needs only 0.010 over to clean up the ridge, so it was a good engine. Crank journals and bearing are not at all scored, mains and rods. Bearings are barely polished in few areas. I probably could have just dropped that engine in my Marauder and stuck my heads and supercharger on it and been good to go, on borrowed time.......
Let me know if you need some good, cheap, used parts for getting back on the road. The labor part really stinks. These things are not easy to work on. I am NOT looking forward to putting mine back together again, and trying to stuff it back in the car.