Timhorr, I change
oil, filter, and air filter every 1K miles.
The
oil and filter are always clean, but the air filter is always FILTHY!
A high-revving 351W sucks down an ungodly amount of air, contaminants and all. A dirty trick I use:
Engine warmed up at idle, note the idle RPM. Jerk the air cleaner off. If idle picks up more than 100RPM, then your Baby is trying to suck air through a pillow. My personal observation only.
BTW, had some throttle linkage hangup problems when we went to the larger Holley, it got better when we smoothed out the cable travel, no sharp bends, that sort of thing.
Like the old TV ad said, "This isn't your father's Buick."
Hey, BackDraft Cobras are hand-built race cars with turn signals and brakelights.
Sometimes.
UT