Depends entirely on use, if not ragging the arse of it all the time, will be fine, seats are hard naturally as a iron head, but exhaust seats need changing for 100% confidence, easy enough job for machine shop.
Or you could hook up a autoflash 2000 lubricator, this is a 1L bottle of stuff that will last at least 2000 miles, meant for LPG cars running without dry fuel seats, but protects far batter than lead additives do, it is simply sucked into the inlet via the small pipe on top of the bottle so fit and forget, just need a little setting up with measuring doses etc.
It's certainly easier than getting some one to fit dry fuel inserts, a seriously hard material that eats cutters!!
tabetha