What Brand Carburetor?????

3 wks go by and where is OP?

You didn't mention what your intended usage was/is, nor why 350hp is your target. For all I can guess, a big 2bbl would fill the bill...................

Do you need 350 or just want 350? And what's magical about the 350?
And what's the foundation under the carb?
Are you familiar with carbs at all? and what is your skill level?
Do you need 350 at 3000rpm or 4000 rpm or 5000?
Or are you just looking to blow thru the tires at every stoplight?
So many questions; At this point;flip a coin.