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I don't think that you will be happy with the CF setup in that configuration, as for why the stock REPU setup preformed well in the application you had, the stock setup has more buffer built into the disk and more clamping force on the pp this was based on it being a 3/4ton truck not a sport coupe. You need to check your gears if you can I would recommend going to a high ratio rear esp if you plan on doing the towing, not the 4.44 or 4.60 (don't have notes with me) from the 74 auto but you def don't want the 77 gear either a nice compromise would help, for your application I would def go with a steel flywheel prefer the 225 one I would recommend a stock one because the rotational mass you need is on the output side to keep the driveshaft spinning. The s/s plus HD disk is going to shudder a little bit but you will destroy a DF disk with the starts. The reason it worked for me is my problem came at higher RPM when the PP didn't have the increase in clamping force that the DF setup did.
AS for the 20b I would ask Mazdatrix for their opinion.
if you need to ask a little bit more pointed questions call me Sunday
210-391-6871
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