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What kind of motor would this be going on and what kind of intake? Does your intake have enough spacing between the carbs to fit the overhang of the holley bowls?

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Ok, here's the plan for the engine. 426 Street Wedge, stock compression. Lunati hydraulic cam #60301 256/262 adv. duration .454/.475" lift 112 centerline, 1000-5500RPM. Edelbrock STR crossram. All painted orange and valve covers decaled to look kinda like a Max Wedge, though obviously not to trained eyes like us here. Now I only have the bottom part of the manifold, so I will be making a top, so making it to clear the carb bowls isn't an issue. It's going in a '47 Power Wagon that has been fitted with 4.10 Dana 60s, a divorced NP205 transfer case, and I have the NV4500 5-speed OD trans sitting in wait. I will be using MSD ignition and electric fans. I already understand that I will have to make all my mounts to intall it, I'm in the process now and it's nothing over my head. I just thought that an engine like that would look cool and run good in this vehicle. But I never tried the dual 390s on anything I've owned in the past, hence the reason for this post. So far the reviews seem good, and obviously I welcome opinions from knowledgeable people who have used these things. But building a truck motor is often different than one for a car, as this truck is very heavy and will haul sometimes. If they work well in a car, what will they be like in my truck?

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I am aware that running a single 4bbl may well be the best way to go, but this is more for looks than anything.

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I thought the STR intakes caused some tuning challenges that might not make them best for a truck? Also with those intakes don't you need a pressure valve to vent pressure from the intake in the event of a backfire? I seem to recall hearing some horror stories over the years of STR's blown open from this..?

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Nice tubing work! I wish I could make 90` bends like that, mine always go a little too 90`. I cheat with aluminum underneath, but that swagelock stainless always looks great. I have a little thin walled stuff left, might try something like that on a 650 speed demon.

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But building a truck motor is often different than one for a car, as this truck is very heavy and will haul sometimes. If they work well in a car, what will they be like in my truck?

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My daily driver work truck had a tunnel ram and two center float Holley 450 cfm carbs, it ran awesome, started excellent during the winter, no drawbacks compared to a single four barrel IMO....
My truck was heavy, it was a 3/4 ClubCab with 1 ton suspension, had 4.10 gears, 29" tall tires, a 727 with a stock stall converter, and could spin the tires while pulling a car trailer with a 1937 Plymouth on it....
440, 9.1 to 1 compression, mild head work, 268 Comp Cam, headers, it was pretty mild IMO....
The intake was a Weiand 3x2bbl tunnel ram converted to 2 four barrels...