A couple plugs [autolite 64] looked yellow/glazed with some specs, and it felt really touchy/boarderline rough at 3500 cruise well into the full advance.
Since I've lowered to 32* total, it's smooth and sounds right if you know what I mean.
My plans been to raise it a lil to maybe 34*, when all is right with cam/comp the SB wedge chamber shape dictates needing only around 30*.
What compression do you have with those aluminum heads and what chamber shape?