[427Larry]

No offense, but why would want to use the phenloic spacer, even with some new improvements that is old technology that has been around for decades. The Coolcarb Spacer will most likely solve all of your issues and it is hardly noticeable. It won't be long before you will be hearing a lot about Coolcarb, Denny the owner is just a one man operation right now, I believe he is an engineer. I can tell you this the racers and the marine community have already caught on and are raving about the results. Not trying to brag here, but I have been building FE Ford's for 45 Years, so I do have a little experience with this.