you can do that. upgrade to ARP main bolts, rod bolts, head bolts IMO itll already be done for when you decide to upgrade imo.
youll have to change the cam gear to an older style so you can run your old harness...someone will chime in i hope im not very wise with that just yet. i think the cam sensor can be changed to your older style..i dunno though.
i dunno about the TB issue bc i dont have a dbw on my W/T project