Well...I've already ordered the "tall" chrome valve covers from Mancini with the standard mount flanges...wasn't aware I could change the booster so I panicked and ordered the new stuff... oh well...if the new ones don't clear I'll be looking at changing the booster. The fabbed valve covers have the bolts integrated and that's the problem...you can't get a bolt in the back hole, the standard mount flange on the chrome covers should cure the problem. Hopefully...if not I'll be changing the booster...