The slants are a little notorious for core shift in the casting. That may affect how far your block can be bored.
My ultimate /6 stealth mobile would have a FI turbo and an OD auto. It might sound like an Electrolux on speed, but I'll be so far ahead, you won't hear me laughing.
SlantSix.Org has the shopping list of what you'll need for the FI. There's plenty of guys who have done this before.
Live long and prosper.