I personally prefer bull barrels on my 1911s. I like the fact that there is no bushing to play with in disassembly, and I like the balance it gives. They do have their disadvantages though. You will need a small tool to disassemble the pistol if you have a one piece guide rod, but many need a bushing wrench on standard guns. However, I have heard that the accuracy potential of the two designs is about the same. As to the modifications to your slide, from what I have seen, all you need to do is remove the bushing and machine the recoil spring tunnel to accept a reverse plug. If you switch back to a bushing setup, it will cause no intereference with the normal spring plug.