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My Circle D is the full billet 4C. I believe it is the 258. I had one of the first ones so I don't really remember. But this thing is awesome. It will take some tuning to get it right but you are in good hands with your tuner and builder. I am sure he knows much more about tuning these things than I do. The converter will eliminate your idle tugging at a stop.
A whole new animal is a good thing. It still drives very well but you have to be a little careful with throttle application. Car will go from being a dud down low to spinning the tires. With all the lock up and trans tuning tables available you shouldn't take any hits with drivability or fuel mileage. You will get into the power band much sooner in the lower gears. You will notice the converter slip if you go with the 4C through the first couple gears until the lock up comes in depending on how it is set up. My converter was built for a single purpose of being the first in the 10's bolt ons. So it is probably a little looser than the norm. I sent Chris my dyno sheet's on and off of E so he could work his magic. Now with the cam and it's loss of driving tq down low the converter is much more civil till you lean on the pedal. Then you just have to ensure that you have TC on or are pointed in the correct direction. The MSD also kills low speed tq so I am glad I ended up with the converter I did. I had my ported stock IM on the car when it was built.
If I were you I would send your dyno graph to Chris so he can build you the correct converter for your desires.
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