No need for long runner Mark.(IMO) The turbo will make plenty of torque. Plenum is good but too much can dampen low speed light load response.
Dont think the sonic tuning of a Mopar crossram will be noticed with boost. The M/T cross ram and the Old Edelbrock street tunnel/cross ram (Mopar "Rat Roaster") can be made to work well in their intended applications but take some re-work(air dams in the Edelbrock) to get fuel distribution in order. My brothers 426 wedge worked best with in-line dual quad top over the cross quad arrangement.(same carbs and manifold base). Car went quicker with stock max wedge cross ram(short runner version). Friend has been running a 413 long ram since high school in a street rod(yikes 40+ years). Looks neat. Torquey but balky cold starts and long warm ups even in warm weather.
Agree Taff has a nice setup. Dont know what the inside of the air box looks like but even though opposed entrance should distribute well the air could still be swirled some. Think I would add screen (like outer mesh of std air filters) in front of each outlet inside the hat to insure turbulence. I'd prefer two opposing inlets per carb and do so by going into a tee(helps reduce swirl) then 90 degree exits into air box giving opposed entry over the carbs and still the coarse screen. That should give max dispersion. The tee's and 90's being same id as turbo outlets will minimize restriction and sort of be a "plenum" before the main plenum. If it looks awkward you can create a cover over the plumbing and box and give the appearance of a bigger box. Aluminum or stainless sheet metal polishes up nice. Like I said I plan to put an intercooler inside my air box and I've just described how I plan to get max dispersion across the top of the core. As always subject to change.
Sounds like a tortured air path but corvair turbo was more turns and twists plus DRAW-THRU carb setup, yet gave good distribution.
The kicker?... Taffs setup may work just fine as is!
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