I have an 80in Evo with the "Old" Branch O'Keefe technology heads and it hits 98hp and 103ft pounds of torque with a 10.25 to 1 compression. I have put 10k on the bike without any real issues. The bike is surprisingly fast for a 575 lb bike. I say if you know how to build a motor, you can make that old tech of Branch O'Keefe work well.

 

Time to move on...step up and get your heads done by someone who actually knows modern TC head profiles (HD & S&S), has an outstanding rep doing them, and delivering PROVEN, DOCUMENTED HP. Period.
You can count that list on both hands.

 

Our heads, once ported, are completed on our Winnona-Van Norman PH2000 Seat & Guide Machine, using Serdi/Mondello/Goodson tooling, with 4-5 angle seat form cutters, centering from carbide pilots, and then checked on our SuperFlow 600 flow bench.
Installed heights within .002" from one another is the norm, and when performing work on the M8 heads, is ABSOLUTELY critical, and then, each valve is hand-lapped to insure spot-on sealing.
Scott