I finally finished my 588 (4.500X4.625) with the PSO Heads. It has a Custom 55mm camshaft 285/300 at .050 with .954 lift and 15 to 1 compression. I used an old Mega block I have had for a while. I used the new Quick Fuel QFX 1050 carbs. John Marcella built the tunnel ram manifold. The Heads are the first ones I did a long time ago and are a little different than the improved ones we have now. I used a Peterson 5 stage dry oiling system with a Charlie’s pan. The oil pressure was too high for the RPM of the engine and we started moving the cam with positive results. The first pull from 6-7 thousand RPM it made 1099 HP. The Dyno starter failed and ended our day early; it was still making more power on every pull. I know there’s still 20HP there.