Poly Engine what was good/bad about it and why is the LA better?

Brooks James said
yes, I had one of the manifolds years ago, 290 hp.
I has been said that is the the engine in Christine {demon car} is a 290 hp dual quad poly, watch the movie closley it is a 4 bolt valve cover BB (probably a 350 , i believe first year for BB was 58. there were some b engines that had factory dual quads. The only one I can think of now is the 383 343 hp, with dual carter AFB

If You saw Christine in the theater, the engine displacement callouts were there, 350. I hadn't heard of one before that, I was thinking "what's this 350 bullshit!?", went to the trusty encyclopedias & Damn!! 1st-year-1-year-only-sho-nuff 350ci Dual-Fury option B engine.