If you like Shell Rotella get the T4 it has enough zinc for flat tappet cams too.
Lots of options but stay away from synthetics if you have been running dino oils in the past. IMHO


1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
In the DITY Gallery
Video of the 261 running

1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration