Gary is absolutely right about the vacuum gauge, but, it's not as easy as you might think. Two years ago, when I was having a variety of carb problems (that eventually turned out to be a tough to spot crack) I ran surgical tubing in to the cockpit along with a vacuum gauge. I mostly wanted to confirm my power valve choice and to calibrate my adjustable Wagner pcv valve. It
worked perfectly for all of that and it was actually pretty interesting just watching the vacuum numbers while I drove normally and safely. Now, my FE puts out an honest 475HP to the flywheel. Some around here call that a "weak sister."
But I will tell you that it was
impossible for me to safely observe the vacuum gauge, that I had hanging from a knob on the dash, while I was at WOT on the street. You might get a glance, but not an observation. I suppose I could have hooked up my son's GoPro, pointed at the vacuum gauge, while I hung on at WOT, but I didn't think of that at the time.
