Never bothered with sheets back when I was playing with that. Was mostly on the dyno to find what afr and timing the car was most happy at so I would know what to tune for. Butt dyno and the 1/4mile dyno both say that I go faster on 14* and a smaller pully (Less timing = I can run more boost) then with 18* and .2 bigger pulley.
I found the exact same thing with my top swapped car.