360 does not seem to be making power and is slow in the 1/8. Need help and/or suggestions

@PRH gave you best advice so far. Find a local tuner and get it to the chassis dyno for a session. Get some accurate data on the car to find out if the engine is happy and if not let them tune it on the rollers and make it as good as it can be before you throw any other money or parts at it.