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I would spend my money on suspension and tires first. It makes the car a lot faster per dollar in the twisties.
Exhaust is the standard barer, Carb's also transform these cars, taking weight out is a great idea.
If it was me I would put a cat bypass and sport muffler on it. The difference from going all the way with SSI's or a back date is not that significant in the 4-7k rpm range but dose help low end response and sounds great.
Next I would go after improving my Air Fuel Ratios and Ignition values.
Might start with a wide band O2 sensor or do it on a dyno. Would make it a goal to get to 13 to 13.2/1 AFR's at wide open throttle from 4000rpm to red-line.
Once I had the AFR's dialed in I would go after the ignition side. Probably would go with a programmable MSD and rebuild the advance curve from scratch. The MSD would also allow larger plug gaps that helps with ignition.
Alternately might just put it on the dyno and play with advance till HP is maximized and pull it back a deg or two for safety. Might check with Andial and see if they have a program for the SC's to re-curve the dist from its smog settings to a more performance set up.
Getting the fuel and timing right is equivalent to putting a chip in a newer car. On a CIS smog car getting this part to its best will make for a solid improvement in throttle response, operating temp, and power.
Another opportunity. The euro and some of the US CIS cars have a 'vacuum sensing' WUR that lowers 'control pressure' (this richens the AFR's) with acceleration.
I would make sure I had this or change over to this. This allows an efficient AFR at idle and cruse with a quick increase in the AFR's to a more ideal value for acceleration AFR. Once dialed in should maintain about 14.5 AFR's at part throttle and near 13/1 AFR's with acceleration. This also helps get the metering plate moving with WOT so it creates a little less restriction in the intake tract.
Last, rear wheel diameter can make a difference. Running a 24" v 25" rear tire size can reduce your effective gear ratio about 4% and get you to into your power band quicker.
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