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TBIs suffer from fuel distribution issues, and you typically get as big a leap in drivability going from TBI to multiport as you do with going carb to TBI. A blower plus TBI can definitely work if you get one with injectors large enough for your HP target and with a MAP sensor that will handle your target boost, but you're leaving a lot on the table - particularly since Gill Welding and Ausiespeed both offer port EFI manifolds now.

And if you already have EFI electronics on the car, you might as well let them handle the boost retard. EFI timing controls require a locked distributor; a Lean Burn unit is a pretty clean way to achieve that if you don't want to go all out and use a crank trigger.

If you're replacing the fuel tank anyway, weld a sump on it and use an external pick up. Less likely to have fuel slosh issues and suddenly lose your fuel on turns, and cheaper. Then run the fuel return in through the pick up tube.