As far as motor mods go, what are you looking to get? More bottom grunt, a screaming top end? You can do these by getting the right pipes, jetting for said pipes, installing better reeds like a rad valve or Vforce, porting, cylinder head work, and even an over size kit if you really want more power everywhere. The possibilities are pretty open for what you want to do and how much money you would like to spend. As far as finding someone to do the porting and re-plate (I think you mentioned porting but I'm to lazy to read through it again), I am impressed with millennium tech for re-plating, and I do believe that they can port as well, however don't quote me there as I'm not 100% sure.