I think you need to do more tunning as your HP and TQ are quite low for your specs. As you mentioned you should be closer to 180 HP at the wheels on a Dynojet. The dyno chart below ( also dyno jet )is two different 911 3.0SC. Specs for the two cars are similar. Stock cams, stock CIS Big port, 9.3 stock pistons, Big port heads, one had headers and the other SSI heat exchangers, sport muffler.
john