My very first car was a 1980 that I put a 351W in. I was 14 at the time, and everything bolted right in (as far as I can remember - 14 was a while ago).
You could actually probably use the same tranny mount, as the 351W and 302 are the same basic block - only difference is the deck height of the 351W. It's longer and that's where you get the added displacement (and also why you will want added hood clearance). In fact, I used a double hump crossmember from a GT, then maodified the holes to match my toploader.
You'll deffinitely want some good headers, fortunately there are several people now that make headers for this conversion. the only real problem I ever had was with cooling. Invest in a good radiator and electric fan. You'll need the right oil pan too. Other than that, it's a piece of cake. Any 351W block should be fine as far as I know.
Like I said - I did mine a while ago, so I may have 'forgotten' a couple things.
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