Im talking to a guy that has a couple 20r blocks hes letting go for a good price and Im definitely getting one but he mentioned he also has a 21r.
is the 21r a good platform for anything? Or is it just going to be harder to build up because its so uncommon?

 

Probably good if you like a challenge

Where are you located? I wouldn't mind having a spare 20R block to take my time with.

 

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i just went from "dont spend any more money on that rusty old truck" to "hmm if i can build a new engine then i can do xy and z..."

 

parts are hard to come by. Where i live, I had to do a 22r swap because thy couldn't find me the head gasket, and I do not live in the middle of nowhere.