good tip steve. i forget about that 'cause that's the kind of mistake you (or someone you know) only makes once. thats enough.
if you use an adapter plate, always check your hood clearence before you slam the hood. (once)

so mr. bucket, is your "timed spark ign." port still drawing vacuum at idle? and if so, when you plug it off, does the idle settle? there should be enough info here now. tell us what went wrong?