D4B DC mods like the LD340 DC mods?
I had to have mine bushed because one bore was worn out. I never paid any attention to the chamfers. I used Morel lifters. They are the only ones that the oil band on the lifter doesn't come above the top of the lifter bore. The oil band is lower on the lifter body. Some of the big name Mopar builders sell them re-boxed as their brand name lifters...lol. My machinist ordered them thru Bullet Cams. Bullet gets them and tears them down, checks them and squeezes all of them to make sure they are good to go before they leave out the door. Mine will come out with the heads on, but dang they are close! The block will need a little clearance smoothed off too, but it is very little.