Rejetting a weber 32/34

Really struggling to find info on the internet about weber 32/34's

Basically what I'm trying to find out is if it can be rejetting to be a bit 'bigger' for a 2litre block conversion? Any info or guides online anyone knows about?

Also, I can't find out, but I am presuming that it is a 'progressive' carb? What do the numbers stand for?

I was thinking about getting an adapter plate made and fitting a weber 32/36 because I am presuming the upper number is the second venturi and means it can supply more fuel, am I correct?

Basically trying to find a carb that I can use with a 2litre conversion that will offer economy at light throttle but will open up under full throttle.

Cheers

JD

(p.s. the rejetting idea I am keen on as money is always an issue in this house…..)