wr400 with 426 head

i am buying a 2000 wr400 and i have noticed the cams from the 426 fit this bike does anyone know if the 426 head and cylinder will fit the 400 also what about the 450 head and cylinder.i have found some tips to wake the bike up and i just need to know besides the exhaust the gray wire mod and the sir filter mod what else i can put in the bike for power.

what about a 426 head on a 400 ? same compression?same flow? needs a set of 426 cams to make a difference? better something? bigger valves? and buy the way i,m runing a 99yz400... i do have a 426 head and i,m watching for a decent 426 cylinder

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