You need to put the tins back on. They are for cooling.
Your exhaust pipe is too short, it will kill power. Better off with a muffler than that.
I think drilling that main was a mistake. Brian Miller is poor guy to get info from. It's about 25 or 30 year old info. Better ways of doing stuff that what he spouts. You mixed info from Kirk and Brian Miller..... should have stuck with Kirk, he's far smarter and a better builder.... but he does a lot of unnecessary stuff too...
1400 RPM idle is too fast, slow it down. 1K is not any too slow.
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