I use the Comp Cams AMC lifters in my engines with pushrod oiling. They work fine in an unbushed block up to about .470 or .480 lobe lift. No issues with oiling. The Comps are fairly inexpensive and you can get them rebuilt for a decent price.

I tried Crower lifters at one point and had an issue with Crower putting the oil holes in the wrong location. They wouldn't take the lifters back and wouldn't refund the money so I had to sell the lifters to a guy with a bushed block. I've also had problems dealing with Isky in the past so these days I just run the Comp lifters and get them rebuilt on a regular basis.