Jake
I could be I'm getting a bit out of my depth now, I have rebuilt this engine before when I fitted the new 264 cams, new belt & titan crank pulley as part of my single conversion and the car ran fine except for white smoke/steam continuously coming fom the exhaust. I diagnosed this as the head gasket as the oil filler cap & the inlet valve cam cover was covered in white sludge.
Stripped engine again, fitted new HKS metal gasket & ARP bolts and the rebuilt it again. When rebuilt it started first time but now runs really rough and won't rev properly, any ideas ??
All I could think was that I had got the valve timing out ?