Well heads were welded and redrilled with a mig welder. Not costly though. Suprisingly it was 150 a head. The 300-36 intake fit perfect but I had to weld and redrill the sucker also lol! It has a very very fast response.
Flow is .400, Static compression is at 10.73, valves 1.94 & 1.50, I believe the flow was around 221 cfm flow after the port work. I couldn't really go bigger in valve size they were pretty much maxed out. Block is 4 bolt 350-.030 over
I don't really know the specs on the Holley 300-36 I've looked all over but no success yet.