Should I have a pms or custom chip already installed before I break
the motor/cam in. By the way its a 347 with afr 185's,Victor intake
42# injectors,long tubes etc. etc.
Think about it this way, A stock comp wont know the values and amounts comming into a new setup. You could try to see if it will learn it "well" enough to keep it running or you can get it tuned and running right until its completely broken in then get it adjusted (if needed).