Is there some good procedure for changing the springs with the head on the engine? I ordered the matching springs/retainers with the cam because I want max performance from the cam swap. Any other datsun-specific cam installation tips are greatly appreciated. On initial startup, what should I do? I am familliar with V-8 cam break-in (fluctuating RPM's between 2500-3500 for 30 mins). Is the cam break in the same (as critical?) on these engines? Again thanks for any good advice.