Would my dual snorkel scoop be affecting my cooling at highway speed?

Fix the dang timing systems;
If the balancer mark is off, figure out why; maybe it's shot!
Cruising at 2000 rpm, she wants probably over 50 degrees.But as close as you are likely to get is 20 in the Vcan and 20 to 25 in the mechanical, for a total of 40/45. My engine actually likes cruise timing in the high fifties.
It's real simple to make new timing marks.... any where that's convenient.
For under 30mph, I suggest to;
Get a 7-blade steel fan on a Thermostatic clutch, and a 180 minimum stat. I use a 195 and the system runs a minimum of 205*F.

Retarded cruise timing means the peak cylinder pressure occurs too late and it is not as high as it should be.It also means the fire in the chamber hasn't finished burning in the top part of the chamber and so instead of the heat going into expanding the gas and pushing the piston down, it goes into the cooling system thru the cylinder walls, and the charge finishes burning in the header pipes, destroying them(eventually), and destroying the headers scavenging ability, so the piston has to physically push the exhaust out. That's negative work. And a loss of fuel-efficiency.... big-time.
But it gets worse
To keep the engine from overheating the plugs and generating random misfires, you might richen it up, making a bad situation worse.
There very definitely is such a thing as running down the hiway at too low an rpm.
There is no way short of a computer to put enough cruise timing into her, and so fuel economy actually suffers.And therefore no way to not generate extra heat.

To determine the lowest rpm to cruise at; plumb a vacuum gauge to the intake, and slowly rev up the engine,in Neutral of course, until the vacuum peaks. The lowest rpm that it does so is the first rpm where the engine is no longer in reversion, and all the air going thru the carb is going in the same direction. Now you can run it a little faster,and a little hotter, and max out the timing, and finally,tune it lean.