That idle sounds "close to normal" for open Vboost. Maybe in need of a good synch or something but with open Vboost the idle is "Good Rough" sounding much more lopey since the cylinders are exposed to the overlap effects of the cams more.
You can install just the Vboost manifold crossovers and cable without the controller & servo and keep it manually held open with a lawnmower type "cable stop" set screw which lets you easily close it for synching. The cable stop screw is just a thing that goes on the cable and lets you pull it open and pinch it at the end of the cable housing to hold it open...
With Vboost open the normal sync tool absolutely will not yield meaningful results.
You can also synch it "manually" with a feeler of some sort and get it pretty close, I've done that for years before buying a motion-pro and in spite of others experience the manual synch was just fine in my book, if it runs on all cylinders at an even lower than normal idle I feel it's pretty well synched...The more the butterflies open the less synch means, as the % differences between carbs (A fixed value due to mechanical linkage) becomes an increasingly smaller % of overall throttle opening the synch error becomes less significant so due to that I consider the idle test the most effective as far as how much the synch error is going to effect or hamper things......The wider the butterflies open the less synch matters......
