project blown slant

I am confused. It looks as if the blower will bolt to the standard square bore holley carburetor flange. Am I seeing things? I understand about the angle and all, but the blower output flange looks like a standard holley flange. i have built a few engines with B&M blowers and they did not have that flange. It was larger. Have they since changed the blower to bolt to a standard flange holley pattern? for the correct angle, simply remove the valve cover, find the angle of the valve cover rail. Take the angle of the carb flange and subtract the difference. There is the amount you need to machine off to make it match. Done deal. If you really want it dead nuts perfect, remove the head and use the block deck as your reference instead of the valve cover rail, but the valve cover rail will certainly suffice. the block deck is perpendicular to the crank as is the valve cover rail. The crank is your point of reference.