My 68 Plymouth Satellite came with power drum brakes...I decided to change it over to manual since it's going to be a street/strip car...I ordered a conversion kit from Mancini and the adapter plate mount holes don't line up with the same holes as the power brake booster mount holes...does this thing require that I center it with the round hole in the firewall (pushrod hole) and then drill 4 new holes...or did they send me the wrong adapter plate? pn is AR6719...thanks...(Mancini is already gone for the day and I was going to work on it tonight)...don't mind drilling the holes and it won't be that bad...just would like to make sure before drilling away...thanks again...