I use the Sealed Power/Federal Mogul AT 887 lifters with the later model shorter push rods. I still have the attachment on my old Sioux valve grinder to regrind the crown on lifters, but I haven't used it in years. Back when I started working on GMC engines almost 70 years ago it was common practice to get rid of the old style lifters and replace them with what we called the milk jug lifter. I'm not sure if the AT 887 lifters are still being produced, but there are probably NOS ones on eBay. Push rods are around. Chev used the same as GMC.