The dyno below is from my car. 78 big port, CIS and SSI heat exchangers. Missed a shift and put engine back together with 9:3 to 1 instead of 8:5 everything else the same. Second is dyno with 9:8 to 1. The improvement from 8:5 to 9:3 was pretty good, 9:3 to 9:8 was much smaller.
john