['ol Pinion head]

Must be working on a '69 or 70 RA4 GTO or a 70 RA4 Trans Am.

Any of the above will have the only studded 4" bolt @ #1 exhaust port for the battery cable ground.
Of course two short studded bolts for the exhaust preheater shroud.

69 Bird RA4 engines will have a short studded bolt behind #2 exhaust port for the battery cable ground. All 6 of the tall head bolt locations at the exhaust ports will take a 4" head bolt, not a studded bolt.

'71-72 455 HO & 73-74 SD automatic code engines, will have an extra studded long bolt on pass side head between 4-6 exhaust. This studded bolt was there in case factory AC was ordered. AC was not avail on 4spd SD engines, & typically the 4-6 exhaust spot only had the 4" bolt.