I sold my 470 motor and built a 512 with CNC ported Mopar '452' heads. The 512 is finshed and has been on the dyno a few times but it isn't back in the car yet. One reason I switched heads was to go with a straight plug. The angled plugs on the Edelbrock heads worked with the HP manifolds but I had to keep a very close eye on the #6 boot. I made a little heat shield for it and that usually worked but you have to check it all the time.

My new 512 has a hyd roller cam in an attempt to make some more power. Same manifolds and Performer RPM intake. I'll also switch to a Holley 950 UltraHP in a search for some power. I was using the Edelbrock 800 cfm AFB and AVS carbs before. The Eddy carbs are great for a street/strip motor but they are down about 10 hp when compared to a modern HP style Holley carb.