Best carburetor and intake manifold for a 273?

LD4B is a good intake but everybody seems to think they are valuable today. Just the stock Edelbrock Performer( not the RPM) will work fine and they are cheap. The Holley Street Dominator came in 2 styles, the regular one didn't have a crossover tube in the back and the Z style did. Either of these is almost identical to a 273 HiPo intake except they are aluminum and they are cheap and plentiful and will fit most of the aftermarket carbs available these days. Stick with a small carb,600 to 650 cfm.