340 Rebuild "Musts"

Yellow Rose and Lustle covered it.

-Have it balanced.
-Degree in your cam or its a waste of time to even build a motor.
-Match components appropriate for your build and application. (cam, intake converter, gears, carb, etc

My opinion, ditch the stock rods and run Scat I beams. For the money by the time to resize, deburr, shot peen and buy good rod bolts you've surpassed the cost of them. This is assuming your not doing the work and having a shop do it.