Welcome to FABO spl440. I have a '67 Fury with a poly 318. What specific questions do you have?
Polys were common in B and C body Mopars from '57 through '67. These engines do not get a lot of support from the performance aftermarket, but parts to rebuild them are readily available, and they can be built for performance with the right parts. Many parts from the LA series engines will carry over, but many will not.
I'm not a poly guru by any means, but the engine I built for my Fury has over 30,000 miles on the rebuild and is very dependable and runs like a Swiss watch! If you are just looking to rebuild as stock, parts for these engines are as common as the LA series. For hi-po, these blocks have been known to be bored out to .090"! Add a four inch crank to that, and you've got 400 cubes.
Four barrel intakes can be had from Weiand, although they may be out of production. You might find one on ebay. There was a factory four barrel intake available for '62. Hard to find those. The '57 Furys were available with a dual four intake. Both factory intakes used the old pot metal Carter WCFB carbs. Offenhauser had a triple deuce intake for the poly as well. Very hard to find those!
Screw FCBO! This is hands down the BEST Mopar forum going. Stick around!