I once aponatime owned one of the Butler&Smith short rod factory race engines. It did not have the utra trick lifters. I have heard thay where titanium and had to be welded in a vacuum chamber.
Some one once made a lifter with a ti button on the top to prevent the push rod from pushing through because of the high spring rates used on the hugh cams. I had an idea to use a R65 lifter its a cup the push rod rides in the bottom. Then the side can be drilled or slotted with no fear of damage. The push rods then need to be longer, Jegs sells a kit ala cut to fit for a hemi eng.