+1 on NOT lowering it right away!
+1 on Sid providing you with a dropped axle, if you do decide to lower it- it is a way better way to go than doing a spring modification, if you intend on driving the truck a lot, because you will not lose any suspension travel/ride comfort.
I have a dropped axle from Sid in my 1950, and am very happy with the result- just understand that if you go for a drop greater than about 3-4 inches, you may have to move up to taller rims to keep the truck safe in the event of a tire blow-out. Another benefit to doing the drop, as mentioned above, is the option to upgrade to modern tie-rod ends at the same time.