Who has 0.030" drill bits? That is smaller than 1/32", and 1/16" is the smallest you'll typically find in a drill bit set. 1/16" is 0.0625", and I'll admit I've drilled many with a 1/16" and never had a problem.
Not only does the hole help to bleed air out of the system, it also helps to flush out trash in the passage, so I don't worry about the hole being a bit bigger. I've torn down blocks myself, removing the galley plugs, and have often found all sorts of sludge, grime, CRAP collected behind that plug - stuff which could eventually work its way into the #8 lifters, and cause them to have problems.
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'73 T/A (sold). Low budget stock headed 8.3:1 455, 222/242 116lsa .443/.435 cam. FAST Sportsman EFI, 317rwhp/385rwtq on 87 octane. 13.12 @103.2, 1.91 60'.
'67 Firebird [sold], ; 11.27 @ 119.61, 7.167 @ 96.07, with UD 280/280 (108LSA/ 109 ICL)solid cam. [1.537, 7.233 @93.61, 11.46 @ 115.4 w/ old UD 288/296 108 hydraulic cam] Feb '05 HPP, home-ported "16" D-ports, dished pistons (pump gas only), 3.42 gears, 275/60 DR's, 750DP, T2, full exhaust
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