Exactly what is it going to take to Run a 340 Six Pack on my MRL 318 stroker

Correct, the 1350 cfm rating system f the 6 pack it s due to the fact that 2bbl. carbs are rated at different pressure drops than a 4bbl is leads to confusion.

In 4bbl. terms, the 1350 cfm rating should convert to approx. 950cfm.(approx. guesstimate rounded off.)

Up for a read? You can go here: THE CARBURETOR SHOP / Carburetor sizes and CFM

In addition to wonderful eye candy, the 6 pack well tuned should perform as well as a single 4bbl. can. The problem with tuning the set up is everyone is afraid of it and listen to those that failed on them most spreading misinformation and creating an aura.

I suggest that you look at the set up as a 4bbl. with an extra set of secondaries. (that also have an idle circuit.)