Lifters
I have several sets of lifters. Isky, Comp. Crane etc. The Isky lifter is offset but all the Busch and ASA motors that I've had used a on center lifter if they used the Crane or Comp lifter. I also have pushrods and rev kits for the Isky lifter. If you dont feel comfortable with a used lifter you can send them to Isky and they will rebuild them at a very reasonable cost. I get $100 for a set of roller lifters.