good point on going back to why you want to change them out.
I am not the end all be all fal guru but in discussions and in my personal parts swapping experience...the FAL trigger has limits on what you can do to improve the trigger pull.
My experience is with the inch type. You can only go so far with swapping springs to lighten the trigger pull before you get failures to reset the trigger. You'll get to fire once and find your gun with a dead trigger. BTDT after de Century thumbholing a gun and didn't have the correct spring (century used an over length chevy coil spring) and I was using different gunsmith coil stock spring samples to get up and running. Let's just say i had a lot of nice springs for good trigger pulls that didn't reset the trigger with live ammo. Down the road on a parts order i bought the OEM spring to be on the safe side.
What you can do, check your parts to make sure the engagement surfaces are square, not chipped, and any pivots are on straight pins and the parts have non egged out holes for the pins. Too much slop is bad and yields inconsistent trigger pulls, more so with a slightly bent pin. BTDT with garands. if the parts are out of spec with loose holes or out of square, throw them away and get new ones. If they are just rough surfaced, one can LIGHTLY give them a FEW strokes on a stone. A light dressing not a drastic polish job or a reshaping. Even with my description and caution it may be better to just leave them alone.
go over to FAL files and do some searches on match triggering a FAL. Put your asbestos underwear on.
Another edit- you will find more fouled up trigger parts in the commercial category compared to the military unless someone tried to "improve" the military part.