Best aftermarket intake/carb for 340 V8 '67 CUDA?

Well my Demon 650 was the Race model. I got it off ebay from some racing school in NC that was saying for each new school year the cars get new motors and carbs. It was a really nice carb I thought. I did disassemble it and put in all new gaskets and did see some metal shavings? It ran pretty much trouble free for me but did notice the metering blocks were fussy on which gaskets I used. Holleys and Demons metering blocks can have internal leaks between the gaskets that may not leak fuel but cause rough running. It kick butt thou for just a 650 carbs. Boy if my d66 intake manifold could take two Holleys and not Carters wow but then I may have never noticed how much smoother a Carter carb could run at under 1,500 rpms.