Mike;
Welcome to the forum. Your "new" Trojan sounds like a nice Parker and if it were my gun I'd leave the chokes as is. Once you remove the original chokes from the gun, in my opinion only, the value of the gun is diminished. Others will disagree but as your gun is tightly choked now it would be fine for pheasants and crows. Woodcock are a different story. This just might require you finding another Parker already choked for those close flushing birds. You really did'nt think you'd stop at one Parker, did you?