I tried feeling for a suck at the exhaust, but it was hard to tell. All I have right now is open headers, and the exhaust was too hot to get my hand close enough to feel anything other than the outward pulse. Center carb dumps plenty of gas when I hit the throttle, nothing excessive at idle. Starting a compression test now, followed by a leakdown test. Will come back with some numbers.
Yes it does, no change with the the vacuum advance disconnected.