Vendors question

[Happy_dan]

This coming winter I want to pull the motor from my truck and replace all seals and gaskets in the engine and the tranny. It's a C-20 327 with a TH400.

Is there a board supporting vendor that I can order all I need?
I am trying to get everything together now so I can just get to it as soon as the driving season is over.

I expect this is valve cover gaskets, timing chain cover gasket and seal, Rear main seal, new oil pan and gasket, input shaft, transmission pan gasket and filter, maybe speedo seal? I am really not even sure what all parts I should be replacing are so if we have a vendor that specializes in this that would be great so I can get advice too.

I looked through the vendor section but that is hard to find a specific vendor for this kind of thing. It is really general maintenance.