Briggs One piece Flo-Jet replacement?

Hi,

I have a old murray mower with a 14.5hp briggs engine and one piece flo-jet carb. The carb has had it with the butterfly valve and throttle rod? breaking.

I reckon it will be impossible to find parts for the old flo jet so im thinking of a replacement. As the old carb is one piece ill also need an intake and air cleaner.

Can i get advice on parts to use for the replacement? The engine is strong otherwise.

Thanks.