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My '78 Chinook has never had screens. Any results on where to buy or how exactly to fabricate replacement screens for these?

Hi, Newbie here, I have a 1978 Chinook Newport with the 20r that runs great but burns and leaks oil everywhere (coolant is clean). I am most likely going to buy a rebuilt 20r instead of doing the work piecemeal, but if the 22R swap is easy enough for most mechanics, then that would be a good upgrade for power. Can anyone describe for me what needs to be done to the vehicle (transmission, mounts, alternator,A/C, etc...) for this process? Pros and cons of the swap? Thanks for your time...