A friend's Imperial with '69 440HP from a B-body is running a little rough, and it's MUCH slower in the top end than it should be - in a rolling start "drag race", it has been handed it's [Edited by Moparts - Family Friendly Site - Keep it clean] by a turbodiesel Renault Latitude...

It seems to me that the problem can be in the vacuum advance regulation - the engine runs too rich, but get it any leaner and it starts to run rough. Maybe some problem in the vacuum lines? Guys who put the thing together have never seen a Mopar engine before, so they could just mismatch something, maybe?

Here are some pictures - maybe someone can see something wrong there?

https://picasaweb.google.com/115646732410106877156/20110915?authkey=Gv1sRgCMHO8LGtganhxwE