Personally, I like mechanical linkage. When I installed a 2 bbl and then a 4 bbl on my 292, I used the same principle and most of the factory linkage. The factory linkage more or less just pushed the carb open with crank/arm that rotated up/down - vertically. I fabricated a bracket and used the same crank/arm in a horizontal position to push the carb open. Now it works side to side instead of up and down. May be easier than it appears to slightly modify the stock linkage.
What's a 270? Is that a V6?
If you need a hand, I'm in San Diego also. Just shoot me an email.
-David