Large rpm drop

Charlesvolare said

I pulled off the primary metering block, and it looked wet in the pv cavity. That sound be dry, shouldn't it? Fuel in there would go straight into the straight to the intake manifold. It looks like my meeting block isn't adjustable but it also looks like it hasn't been tampered with, I'll dig out some pin gauges and check all those sizes

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Correct it should be dry.
I beleive there are two styles of PV gasket. One better matches PV's with rectangular holes, the other with round holes.
Commonly the PV gaskets split when removed, but I don't think this is any of it.

.040 is a lot of T-slot exposure, especially on a newer holley.
Which List number is this?

If you can take a picture of the block.

I'm not ready to blame carb....yet...