Yes, and burn holes in the pistons, too!
Lean fuel mixtures under load, under acceleration, is where stuff starts burning up.
No problem at cruise, on level ground. Very few understand this concept today, not too many did back then.
A lot of auto mechanics had a good side gig re-tuning Ford pickups back in the day. Chief complaint was their brand new pickup couldn’t haul a horse trailer.
One of the big bugaboos was “smog” camshafts. Degreeing the cam would show 4 or 5 degrees retarded valve timing. Now another characteristic is what are called manufacturers tolerances. In some cases, you’d get maybe a mis-ground camshaft, add in tolerance “stackup”, chain stretch or wear, and find the valve timing 15 or 20 degrees retarded. Damn thing won’t even get out of its way