Oil change

Gibbs, Lucas, Penn Grade (formerly Brad Penn) Valvoline VR1, Amsoil, even Hemmings Motor News sell enhanced ZDDP oil for older, flat tappet cam engines.
Two that are available at Walmart are Quaker State high mileage (10W-40 only) and Shell Rotella T6 5W-40. Both will do the job with lots of ZDDP, and don't cost $50 a gallon like some of those do.