Since you have the TQ ready to go I would just get a good deal on a spreadbore intake(aftermarket alum or stock 400 iron) & you're all set. Dont forget the throttle bracket/kickdown changes. EDIT Since this is (I'm assuming) a non high perf deal you could get the alum spacer to run a spreadbore carb on a square intake, it wouldn't look stock but that way there'd be no big expenditure for parts to get you changed over & mock it up to check for hood clearance.