The Gold Cup is not a platform I would modify.
Get a used Springer Loaded and start there.
JMHO of course.
OP: CM makes a good point. Are you looking for an out of the box shooter or for something that would be a project gun down the road?
...It is my understanding that the Gold Cup was set up to run 185 gr match ammunition and if used to fire the heavier 230 gr ammo would cause damage to the gun over an extended period of time unless you replaced the recoil spring and mainspring with heavier parts ( not hard to do)...