HectoRX7

I dynoed my gsl-se over the weekend and was a bit disappoineted by the results. i have a K&N filter RB header, gutted cat and stock exhaust. I did a full tune up a day before the test and I was shocked to see I only pulled 85 horses at the wheels. I know the se is rated at 135 at the flywheel with 20% loss and a tired engine i was expecting a least 100hp. My butt dyno certainly says its about 300 hp
Now what should be my next step to increase the power without rebuilding the engine. will pulling the EGI and adding sidedrafts give me a significant gain. If i do rebuild the engine, What is the typical HP the 6 port 13b will put out with say a streetport and dual sidedrafts?
thanks

Max7

i dyno'd mine many many moons ago, with just a RB full single exhaust (header, presilencer, prima flo) and made 106RWHP and 115RWT with 107k on the ticker
When I pulled the injectors one was more than 13% clogged, you do the math, it was a nice boost in power.
I haven't been back on the dyno, but I can run mid 14's in the 1/4 with 2440lbs worth of car on just boltons.