Not sure about the Crane rockers unless it's a mild cam and my street car runs a .680-.660 276-281 @ .050 Isky solid roller and have for many miles/years w/out issues EXCEPT traction........mid 9's and very easy to drive w/very low maint................ thumbs

72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....