And for the love of god! Don't use regular grease! Use assembly lube/grease please.
Since it's just cams then you could also just use motor oil if you're going to start it up soon.
And, since it's just a cam install then there is'nt really a "break in" for the motor. You will need to re-lash the valves in about 200-250 miles though.
Do not jag up the valve lash adjustments.
I use a "go/no go" system. For instance: the spec is 8 thou. You would then use a 7, an 8, and a 9 thou. feeler. Adjust the lash to 8 thou. Now the 7 should fit no problem, but the 9 should not. And remember that as you tighten the jam nut you will most likely tighten the lash so leave the feeler in there while you tighten them. Then try the 7 and the 9.
7, 8, and 9 thousandths was an example. Check the service manual for the proper lash clearances for your particular motor.