Hi
I recently did a swap on my 1966 Bel Air wagon I built it for towing my vintage trailer. I purchased a brand new crate 350 Cubic inch for just under $2000 from my local GM dealer. It was a simple swap and I had the option of using the original valve covers, and could have used my 2 barrel intake but opted fot a new edelbrock intake(painted orange) and 4 barrel carb covered with a original style air cleaner. I would have been content to rebuild the 283 if it wasn't for towing in the mountains.
Hope this helps good luck
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Anthony