Truck broke today.....I'm bummed :(

[1967C20]

Drove the truck to Charlotte today to show to a board member who was interested in buying. Cruising down the interstate, 3 miles from my destination when suddenly I'm smelling oil, then a slight jerk, then clackety-clack-clack and shakey-shake-shake. Check the oil pressure while I'm throwing it in neutral, still good. Slowly drive to a safe place to pull off, shut off truck, look under hood, and find the hose to the old-style breather on the back of the block has popped off and there is oil on the engine. Pop the hose back on, limp to my destination, check oil - it's low. Had to have it towed; it sounded bad. Checked the flywheel/torque converter connection and it was solid. So...I'm thinking maybe the breather threw out oil starving the pump and killing a couple of rod bearings although I'm a little puzzled at how little oil I saw and why my pressure stayed good. I'll know more tomorrow.