Procomp Electronics has a very high rejection rate - hence the price. I went through 2 of them before I got a "good" one, and I'm still looking for a GOOD HEI distributor. I'm glad I tried their relatively cheap distributor before I plunked down money for a set of their SBC aluminum cylinder heads. I wouldn't be able to afford to send those back twice, nor would tearing down the engine to do so be fun.
Moral of this story: You get what you pay for! Try Summit or Jegs and even the least expensive one you'll find will be a far better part than the one you have now.