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I disagree on the throttle response with the vacuum secondary.
Take a big cam with poor low speed response and slam it with a double shot of gas.BOG.
I think the vacuum secondary would offer better response down low.He may need a different spring in the secondary to fine tune it.
Advancing the cam a few degrees and running 15-18 initial timing should make a huge difference.


I should say that cam and a low compression engine and a vacuum isn't great. I had one on my old 73 440/509 combo. All it wanted to do was dump gas at w/ any PV. I just couldn't get it right. I went with a thermoquad and it really woke up the performance.

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