I've done it both ways. If you don't remove it, you'll have a lot of time in masking it all off. So it's pretty much a wash removing it, vs not. I love the look of a newly painted truck with freshly galvanized trim. That's my preference. It looks a little off with new paint and old trim. However, you're also going to have work to do to the newly galvanized pieces too. That will include, opening up holes, removing excess zinc, re-tapping any threaded holes, etc.
61 II 109" Pickup (Restomod, 350 small block, TR4050)
66 IIA 88" Station Wagon (sold)
66 IIA 109" Pickup (Restomod, 5MGE, R380)
67 IIA 109" NADA Wagon (sold)
88, 2.5TD 110 RHD non-hicap pickup
-I used to know everything there was to know about Land Rovers; then I joined the RN Bulletin Board.