I guess this is where being old enough to have started on carbed motors in the early 80's when I was a kid comes in handy. The blower has to be set up to force air through the carb. Carbs are very passive fuel metering devices compared to port injection. With the injectors, the computer basically turns a spray of fuel on and off during the intake cycle of that cylinder. The MAF measures how much air is going through the intake, and the computer controls how much fuel to spray -- more air, more fuel.
With carbs, the fuel is basically "pulled" out of the carb by the air rushing past the boosters (the round rings you see in the middle of each barrel of the carb). The fuel shears off the bottom of the boosters in very small droplets (vapor, really), creating the fuel/air mix. The faster the air goes by, the more fuel is pulled out of the carb. More air, more fuel.
That's why running the blower through a spacer under the carb won't work -- adding more air after the carb would result in a very lean condition. If the extra air didn't pass over the boosters, the right amount of fuel wouldn't be pulled out.
Good luck - it's gonna be a lot of fun, whatever you decide to do.
If it was me, I'd cut a hole in my hood and stick a big ol' Weiand 8-71 on top of that motor. Those things are made in two pieces -- one is the expensive compressor part, the other is a less expensive lower manifold. You might be able to just change out the lower manifold when you swapped to the 351, provided you could find one made for a Clevor.
Later,
B
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