rebuild kits

I have a 1978 CB400TII that I am trying to get back to good riding order. I would like to rebuild the cylinder head, cam chain, piston heads, rings, gaskets, etc. Is there a rebuild kit available for this? And if not, as I'm quite new to working on bikes, where can I go to find what I need...

Carb kits available for Honda twins, and some assorted used parts. visit my website loudfastugly . I also offer technical support. I'm a one man operation, servicing vintage bikes for 20 years.