I think you'll have steering component interference, that's what most people seem to mention even with larger engine bays. Also keep in mind that the SPA intake is not designed to fit any American vehicle as they are made in Brazil and they only have their vehicles down there in mind for engine compartment fitment, and they are much different than we have here. They do and can fit some engine bays of USA cars and trucks, but only if they have a generous amount of room. The Chevy II is about as tight and compact as they get for USA engine bays.
You're not going to know 100% until you get your hands on one and mock it up with your engine in place. If you have some fab skills you can build you own custom turbo header and be ahead of the game.
