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

Nidhögg;1970733698 said
Yeah, I guess the timing can be setup good enough to break in, but it would be bad if the engine would run lean for 30 mins with a new cam...

Do you have another smallblock available to you, friend, family member?

If so, put that carb on their engine and tune it somewhat. That way when you have it on your breakin, you know it will fire and run for the 15 to 20 minute breakin period.

The timing should be fairly straightforward.