[Spits] Vacuum port

[Richard Gosling]

Bill wrote: "...While I'm not an expert in vacuum dynamics, I would think in
this case that
vacuum is vacuum..."

With the proviso that I am not an expert on this area either, I do think
there is more to it than that.  Based on vaguely recollected forum messages
I've read over the years, you get a different vacuum at the carb as you do
from the manifold - different strengths of vacuum at different combinations
of revs and throttle.  Some distributor set-ups are designed to work from
carb vacuum, others from manifold, it's quite possibly different for the
UK-spec SU-fed engines and the US-spec emission controlled engines.  Some
US-spec engines I think even had a vacuum retard rather than vacuum advance.

The long and short of it is, I don't know the answer to your question, only
that I don't think it's as easy as plugging your distributor to any old
place where there will be a vacuum.

Richard