snip
What I know:
The motor runs good, but does have a vaccuum leak, I am guessing right
now based on some quick digging that it is either the carb plate (nice
wood
version. ) or from the intake gasket(s). No contamination of any
fluids
in the motor from water or each other.
snip
I have had some success finding these leaks by spraying WD40 around the
suspect areas.
When you hit the leak you will get a decided RPM shift.

For the nervous Nellie's of the group ...
Naturally, WD40 is flammable, so the usual precautions regarding spraying on
hot manifolds apply.
Have an extinguisher handy - you do all the time anyway, right?

Mark Browne