No casting info????

I need to upgrade to a newr 904 tranny anyway and the engine came with the tranny and it's torque converter. It's weird that it's a mid 70s block since it has solid lifers and adjustable rockers
Upgrading to a newer trans, will require a new shifter, speedo cable, and driveshaft.
Slant six engines used solid lifters, and adjustable rockers, through 1980. Except I understand there were some hydraulic lifter engines in the late '70's for real world testing.