Re: gas lost
John;
Check your primary power valve and power valve gasket first. If either of them are defective it will allow fuel to drain through them as the carb sits. One very common problem is people using the wrong power valve gasket for the style of power valve being installed which all but guarantees an issue. This is most common when using "generic" power valves normally found in less-expensive rebuild kits.
Another possible issue is a warped metering block surface on the main body of the carb, or a warped metering block. Either can also cause fuel to weep internally and allow the carb to drain.
The carb heat shields are always a good idea as well.
Eric
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