having built a 128CI motor, there is extra power in the extra CI's (cams/58mm throttle body/roller rockers) but what you should do first that makes a real difference is to open the exhaust up, upgrade the air cleaner and replace the ECU with an S&S running file as the lock up Morgan ECU/File detunes the engine.
Have you had it dyno tested? What are the hp/torque gains for each stage?
