c's are a bit rough for the HP valved Mach 1 set. I'd jump up to illuminas. HP's will be at their valving limit on a 650# spring. Not to mention if you want to do that track time on the 1320 then you'll want to be able to loosen up the front for better times which you can only do with adjustables like the illuminas (and pulling the front sway bar)
Of course.. I prefer Maximum Motorsports HD valved bilsteins. They're just about perfect for a street car with heavy springs.
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