Engine cam break-in - What should I do with my 340?

Great info 70aarcuda, thanks!

I talked to my dad, his caprice have a 400 smallblock, so I will probably mount the carb to that engine first and tune it somewhat, so I at least know its working.
But I haven´t really decided yet, the car havent moved since 1991 so I dont know if the fuel lines are ok and not full of slush, or that the new fuel pump will be working as it should, so I still havent decided if I should start the car as it is the first time and drive it around a bit, just to see that everything works as it should.

But I really want to thank you all for the help and info provided :)