Howdy Back Steve:
It really depends on what you want. The 5200 is a good two stage two barrel made by Holley, under contract from Weber. It was adapted to many applications in many sizes. It is like half a four barrel with a primary bore and a secondary bore.
Most find fine tuning and jetting to be a bit challenging, but once achieved, find the 5200 to be a very civilized carb. Jets and tuning pieces are available. Optimized, and driven accordingly, it will give better MPG than a stock one barrel. Is typically has a better idle and slightly more power on the top end.
It is very compatible with the DuraSpark ignition system.
It is most commanly installed using an adapter, which can cause hood clearance concerns. They alos require fabricating a linkage system and an air cleaner.
There are many here who are happily using the 5200. Try doing a search for details. Also see the Sticky at the top of this forum.
Adios, David
