As I said in the other post that got deleted, your biggest challenge at your size is gonna be ergos... ie space from pegs to seat and seat to grips. Your probably gonna want to get a custom seat made, and some decent sized risers. Which as somebody else said, you may need custom cables, so order those right away. Armor on a smaller bike that is lower to the ground would also be a really good idea.
Somebody said flywheel weight, so yeah thats an awesome idea, and you may even want to think about a big bore kit... other than that, learn to use the clutch alot and you should have a ballz out good time.
You already said you had springs covered, so thats a good thing... ride it like the over sized pit bike that it is... as long as it puts a smile on your face!