first off id decide if your serious about a FI setup down the road because with 12.5 pistons ur gonna have to have a hell of a tune to prevent detonation.
secondly thats 84.5 mm not inches just so you know

id just stick with the oem timing belt no need to go anything fancy on this build. your not going to be pushing the horsepower that would require a special belt

and if your asking are the stock cams from a b18c going to hurt you, no. if your asking will upgrading the bolts and not the cams hurt you, no

i dont see any reason to waste the money on a different final drive if your already dropping a complete tranny in.

if your going to be puttin a whole new trans and lsd in then i wouldnt think twice about puttin a new clutch in...even a stock one would be a good idea. awfully silly to put a brand new trans in and reuse the old clutch.

thats just what i think about some of this