[jluetjen]

I doubt that there is much that you could do to a 2.2S to improve the performance except to make sure that it is working as the factory designed. Keep in mind that from the factory it has 180HP and 147 lb-ft out of 2.2 liters. Let see how many other cars approach that sort of performance...

BMW M1 (Street version)
Ferrari 206S
Porsche 944 S2
66 Traco CanAm Cevy
Grp 44 Jaguar XJS B-Production Race car of the mid-70's.
'67 Toyota 2000 GT
Dino 308
Ferrari 330GT 2+2
Ferrari 275 GTB/4
A Loyning Formula Ford engine of the mid-80's

OK, it's not the world's best motor, so who rates higher for power (and torque) per liter? Well the following cars are slightly ahead of the 2.2S...

Mercedes 300 SL (Street)
'66 Chaparral Chevy
Group A BMW 635 and 323 Race Cars
BRM 1.5 V8 F1 Engine from the early '60's
Eagle Weslake V12 from 1967.

I guess my point is that the engine is a great performer right out of the box and there isn't much that you can do to "improve" on it short of a complete re-engineering job, which still may not be as good. The engine is almost as efficient as a F1 engine from about 6 years before the "S" engine was designed, and not far off from the Eagle Weslake F1 engine which had some really good people trying to get better performance out of it. 10 years later, the might of BMW was hardly able to do much better in their Group A race engines.