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"going without the decel valve does increase off-throttle popping considerably"
Thats true on a stock motor.
An odd side effect of having a Flowtech modified fuel head that gives more fuel and a BL adjustable control pressure regulator set for high steady speed and idle speed warm control pressure to lean out the rich midrange mixture of that fuel head to the mid 14:1's is I get alot less popping in the exhaust. Very little deceleration popping at times.
"Also, without the decel valve you can get 35-40 inches Hg vacuum under decels which sucks oil down the intake valve guides and mucks up your plugs."
With bizarre logic like that then all engines need a vacuum limiting deceleration valve and that is not so.
I've had vacuum gauges installed on several normally aspirated cars and during high speed deceleration I've never seen vacuum go higher than around 27 or 28" Vacuum gauges only go to 30" of mercury.
A 930 would have no reason to be higher than that and because they are low compression are going to be less.
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