I had my Dove-C heads pedestals cut down like it said in a book I had but then I ended up runing a longer stud to make my rockers work (using BBC 1.7) I think I would set them on your engine and try your rockers to see if it will all work out with the selected rockers you have dont forget you have to use guide plates with the adjustable studs witch will allso raise your stud some more.