Timing tips

>If in fact the secondaries are running loc-step with the primaries, that is the very first thing I would change. With that small cam, and a manual trans, I can't imagine that to be much fun. IMO, you would have to severely limit the low-rpm timing to not have an on/off switch type of performance, down there..
>With an Ica of just 59.5, Your vacuum should peak pretty early say 1800rpm maybe a lil less, so once past that, you shouldn't have any reversion problems. And honestly, IMO you should be getting an idle-vacuum near 13 inches, or more, already@700. If under 12 @700, I would be looking for a vacuum leak.
>I modded my V-can to get 22 degrees, and it comes in/ goes out, almost as fast as possible. If I lift throttle, Pow it's all in. If I roll on the throttle it drops out. At Part Throttle I can dial it in or out, anywhere between zero and 22 degrees, which makes for a generous amount of low-rpm PT torque.
The engine never complains. Transitions are seamless. It's like EFI without the stinking electrics.
> IMO, if you are trying to cruise at 65=1450rpm in Top gear, with that cam, you may never get the tune right down there; and she will never get the mileage that she will at say2000/1800. ESPECIALLY with all 4 throttle valves opening simultaneously; the vacuum is just too unstable; the tiniest throttle change will throw the tune into a fit..
IMO, you gotta cruise at an rpm that has shut the door to reversion, and with a solid vacuum signal that does not change much with small throttle-openings.
>When I did that 32mpg run, I used a tiny Holley 600VS, with the secondaries defeated (so I could use ALL of the primaries to get up to speed if I needed to), and dialed very lean, with massive(lol) amounts of cruise timing (up to 60*). The trick is that at cruise rpm, the vacuum signal remains steady; if the vacuum is hunting around because the 4 throttle valves are waffling around, your computer is gonna change the injector-on time,(and maybe the timing) and your O2 is gonna have a fit. I doubt it can keep up. At 1450rpm, your engine is doing 24 revolutions per second; at 4 injection events per revolution, is 96 events per second. How fast is your O2?