BBD Blues

I'm running a stock 1972 Dodge W200 (318) and am searching for the best long term carb choice for a general use low RPM plow truck. I wind it out on blacktop sometimes, but generally this truck lives under 3500rpm. I'd build a different motor if I wanted to set the world on fire!

I have run the BBD and Holley 2280 for years on three different 318 trucks, with intermittent performance issues..generally either idle or mid-range. This recent rebuilt one has had a bad hole just above idle since day one. Recently I had some fairly long term success with the Holley 2280 on my '75 1 ton but now the two I own both need rebuilds. Due to modern "puppy piss" fuels I'm afraid that all carbs need to be rebuilt more regularly.

Question Number One:
Anyone know where to get a quality rebuilt Carter BBD? Anybody out there like the 2280 better?

Question Number Two:
If I instead go to a 4 BBL what should I convert to?

For carbs I have
1)Edelbrock 500 4 BBL (used and working fine)
2)Thermoquad from '83 318 factory 4 BBL D250 (OK but probably needs rebuild)

For manifolds I have:
1)'83 cast iron spread bore (for 360 port size)
2)Offy dual port spread bore (for 318 port size)

I also have the square to spread bore adaptor for the 500.

I'd appreciate any comments whatsoever!