I have Crower Valve Springs (68405-16) and Chromoly Retainers (87021-16 ), that I didn't use when I did my cam and heads. These are the springs and retainers that come in the Crower cam kit that they suggest for the rover cams..

Valve Springs - Valve Springs - Valve Train Components
Chromoly Retainers


I will sell then for $155 shipped (CON US).The list price of the springs and retainers is $191.10. If they don't sell, I will return then to Crower minus the restocking fee.

These springs will require machining of the heads. They have a larger diameter than the stock springs.