ive got to join in with the masses. with the expense you're going to go to just to run a t/b or s/c, you may aswell get a lump that is s/c or t/b'ed anyway. forced induction on a standard old engine is just asking for trouble, its designed to run on a vacuum, not to be pressurised.
after you've bought all the bits, it will cost the same amount as a normal fi engine anyway, to see about 20bhp gain, if that.
buy a proper lump and dont be silly.