For our overhaul before, we went to a shop in SSS sa Marikina.. .Gremon Motors. We supplied the parts.
Sa Kamias you can try checking out Sprinter. I havent gone there in a long time but i think they're still OK. My advice is you get a compression test done first to determine if your piston rings are still okay. When you need parts, you may save more by sourcing your parts on your own.