Can't separate oil pan / bottom block on 1981 280zx

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Hey everyone,

I'm in the middle of rebuilding the L28 in my '81 280zx 2+2 and I've hit a brick wall.

I'm trying to get the oil pan and the lower engine block/upper pan (the big cast aluminum piece) off, and it will not budge. I'm 100% sure I've removed all the bolts I can see, but it's sealed on there like it's welded.

Here's what I've tried so far:

• Engine Oil Pan Separator Tool: Did a bit but not a lot.

• Razor Blade: I'm trying to work a razor in, but it's taking forever and barely making progress. I'm worried I'll be here for days.

• WD-40 : Thought that i could break up the seal/glue with it and... nothing

• Tap the side of the pan with a mallet to shock the seal; nothing

I'm getting frustrated and don't want to start prying and gouge the mating surfaces.

Am I missing something obvious? Are there hidden boltsthat I'm not seeing? What's the magic trick to breaking the seal on this RTV from hell?

Any tips, tricks, or tools you've used for this specific job would be a huge help. Thanks!