A modern mechanical cam and springs requires what work on the heads?

Which valves do you have? Factory or aftermarket? If stock/factory designed valves - No - the kit won't work as described because the lock set is for aftermarket valves. You will need the locks for use with factory valves. There's a two groove lock and a 4 groove lock because the intake and exhaust valves have different grooves on them. The lock package you need with factory type valves is 606-16.