.030 and .035If you don't plan on selling it you won't have to worry about resale value so I guess you can do what you want.
But on the flip side, there are more practical guns to be used for a dedicated trap gun than an old 1/1000 3200 with XF/XF chokes (probably meant for live bird gun).
Full and M /IM are a nice choke set though for trap doubles and even sporting clays.
Do not mess with it. Learn to shoot it and grind the targets. Remember choke for smoke! Messing with the choke will hurt the resale should you want something else later..Ok i bought a brand new 3200 1 of 1000 but it is full over full with .045 in each barrel. If i decided to leave it fixed chokes an have it opened up. Opinions please on what to shoot. I like full chokes on all yardages but .045 seems extreme. I will shoot doubles as well an i will probably never sell it