The Rosewood kit is good, comes with good instructions with lots of pictures. Only problem with the DIY kits is there is no way to flow match the injectors once modified. You more than likely will not ever know the difference, especially with Stage 1's, but they might not be as balanced as a set you can purchase.
I would recommend having Jim (Rosewood) modify the injectors and flow match them. You could also look into a set that have already been done, then you just send yours back as cores. IMHO Swamps is the best in the business when it comes to modified injectors, great quality control.
You might also look into AC code injectors which are singles, they are usually pretty reasonably priced.
Ultimately it is up to you as there are many companies that are great injector builders.
For tuning, all the tunes must be for single shot's. It will run without any programing, or programming for splits but it will run very strange.
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