It never hurts to check your carb and make sure the secondary diaphragm is opening. They develop leaks over time that really slows down the secondaries opening.

What you get is a motor that is down about 30% in power.

That said, stock its not a real powerhouse but decent with a stick and it makes good torque.

Without going turbo and keeping the stock cam you can find a few HP by milling the head, a light porting and a weber carb. A decent set of tri-y headers will help a little.

One of the best setup is the TPI fuel injection setup from Australia. The intake needs modification to fit but the intake / cam combo from AU provides about 30 HP.

As pointed out the Starion turbo setup provides a big jump. Its hard not to notice doubling the stock torque/ HP.

Kevin