If I buy an 80 series or Swartz 1911, the block gets tossed, the firing pin spring get's replaced with a XP spring and if it's an 80 series it gets on of these: http://www.brownells.com/handgun-par...prod13121.aspx
and if it it's a Swartz safety, the lever in the frame stays put.
Yes, many modern guns have FP safeties that were design with the gun. The 1911 FP safeties were later add-ons. IMO they're not needed and give more room for error, but if you're fine with it and have no problems, leave them be.