I am building up a 1275 with a A series block but have a new A+ dizzy. Can someone confirm what parts I need to marry the two together? I have an A+ drive and an A series dizzy mount but the A series clamp will not fit on the A+ locking collar. So do I need to keep the A series dizzy mount but use the A+ locking fork? Are the lengths of the A+ dizzy and A+ drive compatible with an A series mount?