so check into AMC/MAgnum lifters and hollow ball/ cup pushrods
pushrod seat height may be different
how did you end up with the older chevy version instead of the HL version? will they swap?
unless you have max compression and you are trying to bleed off some dynamic compression the 274 HL might work better
cheers
do the mid lift geometry determination before ordering pushrods- adjuster almost all the way up to the max - forget the old 3 threads rule because the new adjusters are longer- you may have no threads showing with these
