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Nope. Boost is a function of backpressure/restriction in the intake tract. An engine with lower boost can actually make more power because more air/fuel mixture is passed and burned. Think about a compressor (of any type) spinning at full speed on an engine that’s not running. Boost gauge will...

A hollow fuel pump bolt is NOWHERE large enough to use for a turbo drain fitting. Those are either 5/16" or 3/8" bolts, and there still has to be some meat for the threads, so you're looking at a 3/16"-1/4" hole at most. The typical rule for a drain fitting is that it should be 1/2-5/8"...