[69 longhorn]

Hotter cams like more initial timing. I saw an article on duration & initial timing(think it was in comp cams site). best to listen to what the eng wants,& go from there. On my 383,I run 16 initial/34 total,all in @ 2700,& 10 degrees on the vacumn can/plugged to full manifold fitting on the carb. I also have alumnium heads,loose converter,& 4.10 gears,so the eng never sees a heavy load in the lower rpm ranges. My comp XE268 is 224 intake/230 ex duration @ .050.........69 longhorn.