@Ron: thanks for your offer. However, I was was able to obtain one on eBay. If its condition is bad I’ll come back to you.
@uconn86hgiv: also thanks for your input.

Unfortunately, this is a project that my limited experience and tools prevent me from doing on my own. So the only thing I can do is to order used parts in advance and gather information on which companies to choose with respect to new gaskets and quality.

I’d like to know which engine sealant kits are recommendable. Summit Racing offers one. But I would choose Bop for the divided rear main seal (Viton) and one piece oil pan gasket and omit respective parts of the sealant kit. What do you think? I suppose the suitable down pipe bolts and exhaust manifold bolts can be ordered arbitrarily - or is there also a company preferable?
Thanks in advance.

Olli