What vendor has any had luck with for injector rebuilds? Witch hunter hasn’t responded to me after a week so I’m guessing he’s not interested. Looking to have a couple sets cleaned and new seals. Thanks in advance

I’m beginning to start my 88 build. My plans are to take it to the frame and work my way back up. Looking at parts and gaskets for the new engine rebuild. My question is how does everyone buy in advance of getting motor checked out? Head, block , etc. I’m looking at camshaft upgrades and if the head could has an issue than it’s better to buy a whole head. Looking for suggestions how others have done their projects. Thanks in advance