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You are correct on that point, I will be checking my local independent shops to see if they want the job. Not everyone wants to work on these. The first thing I will hear is the job would cost more than the car is worth. I bought this car new in 1994. I gave it to my dad in 2012 who in turn sold it to my brother in 2018. My brother did a swell job of running it into the ground, but when my dad passed away 1/2020 my brother didn't want the car anymore and  showed up at my house a month or so later and handed me the keys. That makes me the 1st and 4th owner. There is no mechanic on this earth that's going to be successful in convincing me that any job needed to be done on this car will exceed its value. I watched a 24 minute video earlier today on how to do this job. II won't be doing it as a result of watching it. These videos are valuable in that respect as well. 

Wow, you've almost had that car as long as I've had my 89 Cutlass!  Can't remember if I got mine in late 93 or early 94. Yes, that seal goes bad in all of them.  Not if, but when.  Rear main seal is rare.  Oil pump drive O-rings going bad I'd say is 100% rate. If you were going to DIY it, I'd say don't worry about pulling the rear head.  I owned my 94 for 12-years and my fudge-fix lasted for most of that time up to the day I sold the car.  If you're having a shop do it, I imagine the intake manifold R&R itself isn't cheap, so I can understand wanting to do the head gaskets at the same time so as not to have to pay for a repeat job in the future.  However, head gaskets on a DOHC V-engine sounds like it could be quite expensive labor-wise.

anyways, welcome to the site. 

I wanna see pictures of the Gran Prix, never seen one before!   /s   Welcome!

Thanks all for this. As of the moment the car is in storage do it will be a while before I can check it out, but I will say I get more & more confident this will be the cause. It has been happening for a long time. Form the day I bought this car in Oct., 1994, I always wondered where a quart of oil was going every 1000 miles or so. My money is on this as pictured above, it was probably badly sealed to begin with. And these things don't get better, only worse.  I went in and checked my 2020 repair bills from when I had the intake manifold gaskets replaced. The mechanic also replaced the gasket for the part 10130955 as you see in the photo but no mention is made on whether the distributor plug seal was addressed so I am going to assume it was not. While it's a shame all that work that was done to the motor back then would have to be re-done just to get at what needs to be repaired, so be it. Even if I decide to get the rear head pulled to replace the O-ring rather than trying my luck with sealant, that's still way better than having the entire motor pulled. I might as well go the whole 9 yards and have both head gaskets replaced for a one and done job.  I should be getting the car out of storage within the next few weeks, I'll keep all posted on how things progress, and thanks again, much appreciated!