256 parts?

[Imaginearat]

Hi all, I need a std piston ring set and a cam chain link for a 256 engine. Can anyone suggest a supplier as I can't find any in the UK.
Also, do I need a specific 256 gasket set for the top end or can I use 447 gaskets?
Thanks.

 

[650Skull]

Heiden Tuning 70/71B have different gasket sets 72 and later have the same