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Crane iron rockers and 3/8 pushrods need to clearance the head to fit.

Using 3/8 pushrods (good idea) on Mopar BB iron heads typically will need grinding some casting flash on the heads. It shouldn't need much. If the rocker isn't centered on the valve, shims against the rocker shaft holddowns might help.

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