I think you might have to make an adaptor to fit the Miladon cover. I've got a 402100 summers drive (sm/blk), but it also has the summers timing cover and i run their duel idler gears, unlike the miladon single idler gear. You may also have to make an spacer washer for the cam button hex drive. I ran this combination over 20 yrs. ago on a blown rodek but i don't remember what all i had to make for it to work. I'm assuming you bought a summers 402200 distributor drive unit, but i don't think you can use the summers timing cover over the miladon gear drive unit. I also run a 5" extension to drive the front mounted enderle 110 pump.
Bottom line i think you will have to make some pieces to use the setup.
JMO
Zip.