If you are burning that much past the bad seals you might want to check the movement of the valve in the guides. You could have worn guides also and in that case the new seals will not stop as much as you hope.
I agree. The heads were rebuilt with new guides and seats in the early 80's. Probably 30k miles ago (dad did not write the mileage on the receipt....). So I hope not, but they may be. If they are, then that will give me an excuse in the future to go with a rebuild of the motor and install aluminum heads, flat top pistons, etc., to get the most out of the motor, at least in realistic terms anyway. All kinds of ideas are floating around in my head about what I could do with the motor. Leave it low compression and add a low boost turbo, increase the compression and leave it normally aspirated, etc. Much to consider, but I have time. Even if the guides are worn, the motor runs too fantastically to be worn too bad. I have time.
The next big project for the coach is paint. That is going to be a big one. I am going to completely strip the exterior, pull windows, etc. While the windows are out I am going to replace all the seals, guides, and hardware so they function like new again. So far I am convinced I am going to keep the original paint colors and style, in restomod fashion. Keep the classic look, but be all new under the skin and inside. I love how many comments I get on this coach when I travel. I feel some of that would be lost if I went to modern colors and graphics. But I have a couple more years to save and decide about that.
I am installing new tires before my March trip to AZ. At that time I will have the wheels sand blasted and I am going to professionally paint them as new again. No more bomb cans every couple of years. I need to talk to the local auto paint shop to get a paint recommendation so I can do it right. I thought about powder coating, but that is still expensive and my yearly budget is busted for this year on her. A quality paint job on the wheels should last until I swap tires again in another 8-9 years or so. Stuff does not rust in this part of the country.