Yes, it has only one. I only went from 65 to 70 in the secondary. I also rechecked the idle vacuum today since I pulled 5 more degrees of timing in it. Now it has a tic over 6hg, like 6.2 or 6.2.....and it's more stable. Primary went from 55 to 59 and secondary went from 66 to 70. Both were the stock sizes before I changed them.
Now, I do have a strange anomaly. On occasion, when I start off, it will have a flat spot RIGHT off idle. Doesn't do it every time. Does it WAY less than it doesn't. My thinking was maybe it was PV related since I pulled the timing up. But after checking it today at just a tad over 6, I'm thinking the 3.5 PV is still the right one. Hell.....I've gone up with jet sizes.....I tried to go down on the pump shot from the stock .025 to a .018......I'm wondering now if it might not need a bigger pump shot as well.
