Clutch Recommendation Please

So it sounds like Centerforce is the best thing to use. After a quick search it appears I need the Centerforce DF269739 for my 1970 Swinger 340. I'm getting prices of about $350, which is about 3x what I'm getting from Rock Auto non Centerforce clutches. Does that sounds right? If I were to go with something more stock (and less money) what would you guys recommend?