Which clutch and PP?

I have a 67 dart , 340 pretty well built high 11 second street car. Not raced anymore but not saying ill never go to the track again. It has a 23 spline with a centerforce 2 PP and a RAM paddle disc , A dana 60 out back with 4.56s. The car hits way too hard and I am tired of breaking parts when I powershift on the street. I'm looking into buying an 18 spline from Brewers but I'm told by them that clutch setup is way too violent. Any recommendations on a clutch disc and PP? Again , looking for something durable but not overly aggressive. Again street driven car and might go to the track once on nostalgia day but still want to rip gears on the street. Is the 18 spline overkill? I'm looking to do this once and not have to worry like I do now. Thank you!!