i'm thinking i would tap the hole where the restrictor goes in the case to 1/8npt. the hole is already the correct size for the tap. then get some female hex pipe plugs and drill several different size holes in them to get the results you want. just make sure the holes are tapped deep enough to allow the plug to seat below the valve body sealing surface.  I did this mod to mine last week to replace the existing stamped restrictor plug w/ a threaded one drilled to the same .14" orifice.
2021 Challenger 6.4L Scat Pack 1320
100% stock: 1.680, 11.894 at 113.75 (DA 175 ft)
weight reduction, wheels, tires, Hellcat air box: 1.661, 11.686 at 115.97 (DA 710 ft)
1973 Challenger 452 ci street/strip [2008]
pump gas, DOT radials: 1.454, 10.523 at 126.44 (DA 514 ft)
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