I concur, by the round rubbers on front indicators it either a 250 or 400 and also the 2 screws under the nose tip on either side
but the ignition cover does not look like the 250 four barrel.
My 250 did not have oil cooler covers moulded to the fairing and think it might just be the phot angle
Forgot to mention the bolts on lower part of frame as that front section is unbolted to enable removal of the engine.
Daryl is correct in spotting it as a 400