You didn't mention that you had removed your balance shafts. You would pick up a good few horses with them out

Here was mine,



It made about est. 150hp@crank without the balance shafts, lightened flywheel, header and exhaust, plus minor tuning with a timing bump and SAFC.

16.1s/85mph 1/4mile on the heavier (2750lbs) Galant.

If done similarly, with the higher 9.8:1, you can look at about 160@crank.