A little note on A/F ratios. The readings can be off depending on the location of the O2 sensor.

 

Exactly right, Dan. The dyno done in my area had the a/f sensor in the tailpipe. Hardtopguy/SanMarinoCpe had it checked at the primary O2 sensor(header).

They had to up the FPR to stay safe, but now I run quite rich down low. EMS of any nature is in order. Here is the before sc dyno in OH and after sc w/ 7lbs pulley. The pulley itself made ~22hp(not pictured).

 

They believe the stock plugs caused the drop in hp at the top end. I have IK24's ready to go in, however, I am seriously contemplating using copper and replacing frequently.

 

Absolutely nothing wrong with that approach. I use Copper Bosch plugs and replace every 1-2k miles depending on how I drove it (you might be able to go longer). At .97 cents a plug compared to the $15 plugs some folks by I think it's a quality investment. If you are a mechanically inclined person who checks plugs frequently anyway it doesn't make sense not to go the cheaper route.

 

Nice numbers for a untuned car.