It depends if it is a pioneer or older style. for the pioneer there is an ignition plate with a recess so it will clear the bulge of the cast cylinder. Then you also need to use the old keyway ( not the pioneer one) as your ignition tming would be 90 degree off...
I bought a second hand QDP that has this recesss in the ignition plate. QD might selle them or you need to seek someone who can mill it out for you.