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For what it's worth I run 2.25 stainless in my -1 head. T&D paired rockers, Comp 892 tappets. Pushrods are 7/16" tapered .165" wall. I found a broken spring at Monster Mopar. It shattered the outer into 4 pieces.

What valve springs were you running?
What cam lift and rocker ratio?
What shift and finish line RPM?

I just started running the same rockers with 1.65 ratio, but with Ti retainers and the same lifters (pushrod oiling). My Manley springs are 300 seat/700 open. Gross lift is 0.777/0.774" (less after lash).

1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1