Howard's or Lunati
I put a Lunati 703 hydraulic with their lifters in my 340,
might have 2000 miles since the rebuild and a couple of lifters are already rattling, I have to reseal my intake so while I do that, I'm putting in a solid lifter cam, I'm done with hydraulics. By the way I'd go with the Howards if I had to go with the two choices.