removing camshaft

["Peter Zindel" <zpcz@xs4all.nl>]

Hello Listers,
I want to change the camshaft with the engine in the car, is it necessary to
remove the inlet and exhaust manifold? This is what the Haynes manual is
telling me. I can't think of a reason to remove these manifolds to remove
the camshaft. I'm planning to fit a Kentcam TH5 camshaft, are there any
special things I must take care off? Like different valve clearance , timing
etc...? Is it necessary to use a timing disc? Any help would be greatly
appreciated!
Kind regards,
Peter