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You would have to get a set up for a 351C, and run a set of 400 intake spacers and get a longer belt. I don't think anyone makes a manifold for the 400
i was told that bds makes something for a 400 not sure though. i was on their site but couldn't find it (im @ work so i didn't have much time to look) there is a tech line. i'm sure they could help u. if u find out something, let me know thanx- matt
BDS offers both individual parts (including the manifold) and complete 8-71 blower kits for the 351M/400 engine. 351M/400 kit part numbers start with 578- prefix.
IMO, if you want performance more than "looks," a better solution would be to adapt a Paxton or Vortech blower and intercooler, and set up the carb for "blow through" operation. It would be more custom fab work, though.
I wonder how much one of those beasts costs and just how much boost are you getting out if them and if it is possible to get higher boost by running a smaller belt but if someone produces one.