My 367 only has about 425 hp, (currently with a Hughes 230/110 cam in it), as indicated by a 93 mph Eighth mile.
Previously it had a bigger 292/292/108 cam in it. I never tracked that combo.
I did the power tuning to establish the MJs, and power timing.
Then I took the PV out and roadtested it with a vacuum gauge on the windshield. I have a 4-speed. I got her into second gear, and took it up to ~30/35 mph and played with the throttle up to ~50 mph. It was easy to spot the lean-hole developing at 10" vacuum. I screwed the 4.5 (half-idle vacuum) back in, and the hole was still there. I had bought a Morosso PV tester and learned how to use it, organizing my valves according to the tester which in very few cases matched the stampings. I worked my way up to the 10.5, and saw a marked improvement in throttle response and torque delivery, and the hole was just gone. I had snuck up on it. Then I worked on my timing curve, for a couple of weeks. Later, I dropped two jet numbers, with no change in tip-in performance, and the hole did not return. But the engine had become an animal.
Happy HotRodding
Oh yeah this was on a 292/292/108 cam that idled around 8 to 9 inches depending on the idlespeed.and idle-timing (usually down at 14*). Best vacuum was around 2400 rpm (kindof guessing, that was year 2000). And It cruised at 56=~2600 with 3.55s and 245/60-14s, still at same vacuum.( that part I remember, from the hours and hours it took to go the 20 miles to work as my DD).
EDIT: that cam was only in there until midsummer, when I had enough of filling the tank every couple of hours,lol. I sold it and moved on. But I just gotta say; from 5000rpm on, that thing was a beast. The brand new 245s never stood a chance; they were done before the cam came out.