To upgrade injectors and coil packs. I am looking at doing a cam and possibly rr's, pushrods, springs and everything. Should I upgrade to the MSD coils before or after that or do I even need it. Also when do those stock injectors get maxed out?

 

Your stock 26# injectors max out when you do a decent sized cam and put down around 420 rwhp.

The coil packs never need upgrading. Mine are stock.