On a pre mag la block im using nos oem non pushrod oiling roller lifters on a .540 lift reground factory cam.

Its my understanding the early lifters were a bit different then the later mag lifters that I think pushrod oiled, but I could of used the newer oem as well.

Ebay has some decent oem roller lifers in the $130 range give or take.

The early lifters were known to tick a bit on startup because of the oiling hole location which they changed in like 89 and there was also a tsb for it.

But so far ive not had the "tick: issue on startup.