First off let me admit my ignorance on the maximum weight capacity of a 430 loader. However, that said, if you are going to use a clamp on fork you need to understand the dynamics of the FEL loader ratings.
Many manufacturers rate their FEL capacity at the pivot point. Some also give a capacity rating at 19.7" forward of the pivot point. The difference between the two is striking. The farther forward you go, the lower the rating. So for example, a FEL rated at 1250 pounds at the pivot point might be rated in the range of 850 pounds at 19.7" forward (which is about the middle of the bucket). Add some clamp on forks that are even farther forward and the capacity is likely to drop even further.
Also consider there is another serious limit, that is the strength of your bucket lip when you are using clamp on type forks.
If it was me, I would use and ATI quick attach system, it allows you to pop the bucket off and install forks with almost no effort. It also preserves as much of the capacity as is practical. But do a little research into your loader's capacity to figure out what you will be able to ACTUALLY lift. You can find the capacity ratings on the JD website. And don't forget, the weight capacity rating is the TOTAL capacity so you will have to figure out how much the pallet forks weigh. If those are 150# and you have an 850# total capacity, that means the actual pallet weight you can lift is about 700#.
Now if you want the greatest capacity definately go with the pallet lifter on the 3pt hitch. Most tractors have 3pt capacity that is 50% to 100% higher (or even more) than their FEL capacities. The obvious downside of the 3pt hitch arrangement is the lack of height so you can't pick things off the rear of a pick up truck or semi truck if you use a 3pt arrangement. The 3pt hitch pallet lifter is great for moving stuff around, but not for loading or unloading trucks.
