I'm going to run a Vortech V-1 S-Trim 20psi supercharger on my 87 coupe. I've got a buddy with a set of Edelbrock Performer RPM heads that has a mild port/polish job that he will sell me for $800. I would like to know everyone's opinions or experiences with these heads. Any problems? If so, please suggest a head that you would recommend for this application.