HELP!!!!!!!!

Shouldn't be a problem with putting your stock fuel injection stuff onto the new engine.
There are flat tappet cams that will work just fine with EFI. Its just not very popular.
You can also run a roller cam with roller lifters that are tied together to keep them from rotating. As in a roller cam conversion kit.
Just need to contact Summitracing or someplace similar and ask their tech support on what to use.