I have a 427 sideoiler that was blueprinted and balanced and the rev limiter was set for 7000 RPM's. Several years ago I missed a shift and bent 2 pushrods and broke a rocker arm. I did not know where to go for the rockerarm or pushrods so I called Dove Engineering and they were able to get an exact replacement rockerarm and a spare. Also; new pushrods. The person I spoke to said I should set the REV limiter for 6000 RPM's. 7000 is too high.
I use 6000 RPM's now. Why take a chance!