['ol Pinion head]

'68-70 Pontiac V8's (exc '70 v8 Firebirds) shared the same design crankshaft pulleys.

Water pump pulleys are a different story. The stagger (design of the wp pulley) changed between the '68 8 bolt wp pulley & the pulleys for the new for '69 model 4" hub height 11 bolt waterpump.

When the '70 model A,B, G series Pontiacs we're introduced in August of '69, the 4 1/2" hub height 11 bolt water pump was introduced. As '69 V8 Firebirds continued to be assembled into Nov of 69, they continued to use the "351" casting 4" hub height 11 bolt wp & it's 69 model wp pulley. There are no early & late '69 model water pumps, all '69 Pontiac V8's were originally assembled with the short "351" casting water pump.