I have found a few leaks by pressurizing the intake through an adapter on the throttle body. I have also,done the carb cleaner trick as well. I have really bad hearing so it's hard to pinpoint where a leak is coming from. I've had leaks from the maf, iac, upper intake under the supercharger, octopus on the top and an injector o ring. I just found a leak in the coolant loop thingy under the throttle body and sealed that up. Now if I pressurize the intake upto 20 psi it takes about 20-30 seconds for it to bleed down, no some or all might be coming from my contraption itself. The last 10 psi takes the longest to bleed. Does that sound acceptable?

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86 SE Convertible 3800sc 4t65e HD.

I'm surprised it lasts that long. normally it will/can bleed down real quick. I never tried it on a SC engine, the SC itself might be sealing it. as normally you will have a valve open, and leak down pass the rings or any valve overlap and it just all leaks out. When I pressure test for leaks I leave the compressor hooked up with a regulator for pressure.
I tried the "just add pressure and check" but real quick I found that doesn't work.

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"DRIVE IT LIKE A FIERO"
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I have a cap with a one way air valve like on your tire, and it's clamped to a silicone coupler and that's clamped to the throttlebody. Then I plug the lined at the octopus thingy, and the port off the throttlebody that goes to the,purge solenoid. I have no boost bypass or egr so no leaks from there. I have a vacuum guage at one port at the octopus, and I add air through the throttlebody and watch the guage and spray soapy water all over and look of bubbles. I have done this numerous times on this motor as well as others. Sometimes I can't access certain parts of the engine as with carb cleaner it has to be upright, so a spray bottle gets the solution there.

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86 SE Convertible 3800sc 4t65e HD.

I'm in sardonyx24 corner. Ring gap, valve overlap, etc. your going to loose pressure real quick. You may have a better shot by forcing a potato into each tail pipe then pressurize the whole system head to toe.

Spoon

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"Kilgore Trout once wrote a short story which was a dialogue between two pieces of yeast. They were discussing the possible purposes of life as they ate sugar and suffocated in their own excrement. Because of their limited intelligence, they never came close to guessing that they were making champagne." - Kurt Vonnegut

Well what ever I'm doing seems to be working as I have found a few leaks this way. I see now with all other factors it will not get a perfect seal, but I'm happy for now with a 20-30 second bleed down from 20 psi.