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I am very sorry to learn of your new problem.

You have demonstrated incredible resolve to overcome previous problems, and I am sure that you can do it once again.

There's a round thing in the borescope photo that looks like it could be a piece of a valve head or seat

Are the intake valves sill in place? Can you tell anything by opening the throttle and looking?
Might also pull the cam cover to see if the tops of any of the valves look weird.

Time for 12.5:1 pistons!

That is basically what I was already doing.....this is the cylinder that was 40-50psi low on compression.....most likely because the air was leaking past a loose valve seat.

Way back when I was putting in the seats I realized I had 20 and 4...same part numbers but the 4 mic'd smaller. I called, they told me I was nuts but I ordered 4 more and they matched the other 20. After the seats were installed and Iwas picking up I could only find 3 of the small ones and had 1 correct to spare....and no way to find the small one.....but it should be ok......I suspect I've found it.

I am tempted to fire it up 1 more time with the new fuel pump and a new O2 sensor on the rear bank so I know I have things close for after the tear down.....but I don't want to do anymore harm....I'll need to think about that.

There are some other things I want to look at.....oil pressure is a minor one but the big one is designing an air box and filter system is another. Finishing the wiring up front and putting the cabin back together. My steering rack is leaking oil and all the suspension bushings are crap. This stuff Ican get fixed/finished while the garage it going up.

Bummer!

At least now you don't need to worry the thread will end

Changing the subject I've been thinking quite a bit about the air box and stacks and holes in the hood.....I"m thinking no on the holes. I would be willing to relocated stretch the bump in the deck lid and MAYBE raise it an inch of so but that is about as far as I'm willing to go I think.

I think I'm going to put the deck lid on and see exactly what space I have to work with if I follow those rules then spend the next week or so pondering what can be done....I'm kind of envisioning U shaped stacks hidden inside a big tuned airbox. Since I'll have at least 1 head off some I'll be able to see what it does to airflow vs the stacks on it that I used for all the flow work.

Dynomation wants the stacks LONG....18.5"open to valve at least depending how much taper I give it so a twist is the onlt way it could posibly fit. Then I need a place for big air filters....trunk maybe?

Can you put them above the wheel houses so they pull cold air from the fender intakes?

I want to connect hoses there for sure but I'm not sure there is more than about a 6"diameter....i'm not sure that is enough for decent flowing filters. Maybe

Or maybe I run hoses from there to filters in the trump? I need to spend some time looking at it.....

K&N does have a lot of options.....maybe.

The k&n web site has a formula to calculate the filter area needed....mine is 124sqin. min. The formula is based on ci and peak power rpm and the example is 350.....so I suspect it assumes relatively low VE. Still, it says i don't need a whole lot.

Way back I had talked about using 2 stockish housings...that might be enough.