['ol Pinion head]

Not hard to look at the head codes & date codes on them. ESP easy if the car does not have factory AC. The block casting number is also easy to spot. The no timing tab timing covers began usage in '75 & with the small hub & matching diam cast pot metal timing tab, one will run across them up into '77. In pulling engines cores I always pitched the small hubs & the cast small timing tabs & replaced the small hubs with a decent used normal size damper. On occasion, have pulled the later usage plastic style timing tabs when I had time in Pick-N-Pulls.

Am betting the block isnt going to be an XH from a '69 GP or it would have the goofy motor mount adaptor brackets on it. Those usually contribute to shaker scoop mtg issues. I'd look at the head casting numbers, on the center exhaust portion of the cyl head, then the block casting number on the flange area. With the small hex style spark plugs, good chance the heads are off a '71 or earlier engine.