Holley 885 leak down test

[Marv 49]

Still playing around with eliminating all the leaks from the carburetor on grandpas 49’. Last night i meticulously fiddled around with the float and got the fuel level to 1/2” below the top of the bowl (7/32 to both sides of the float). This morning i found it had leaked down about 7/16” of fuel out of the bowl. I expected this result after some reading I had been doing. I did not see any fuel outside the bowl, so that leads me to believe the power valve is the culprit. Is that a correct assumption and is there another way to test this theory? If the issue is with the valve, is there a replacement for this carb? My quick search for a replacement last night didn’t really turn up anything so what ever information you guys have would be appreciated! Thanks, Happy Halloween!