40 mercury flathead with columbia 2 speed

[Swarm]

Hey got a question that I was hoping to get insight on. I have a chopped 40 merc that has the original drive train. I was gonna have the trans gone through while I have the flathead rebuilt. Might go 10 over with 1:6 valves and a mild cam nothing crazy just a cruiser and put a columbia 2 speed in.
My question is should I just go with a single big 97 stromberg or dual carbs or even a 4 barrel carburetor. This is just a cruiser not a hot rod or anything im going to go crazy in. But I will be driving at sea level in Central valley California up to 7k ft elevation up around bass lake and sometimes shaver lake.
I was even thinking of putting in autotrend efi, but I am wanting to stay traditional and I know that will be thrown out with the efi. What would be a good carburetor set up for this. I am stumped, oh ill be putting on sharp heads and sharp intake...i don't know what to do