Thought I'd post my engine config and dyno results from my 555 for reference. Dart Big M block 4.560 bore. Eagle 4.250" 4340 Crankshaft, Eagle H-beam 6.800 rods, JE domes. I dont remember part number but made a little over 14/1 with 118 chambers. Heads: Dart Pro 1 345, K-motion 1.625 doubles w/dampers, again dont remember part number. Around 300# seat with shims. Heads hand ported by Xsr Cylinder Head. Flow: 385/in 303/ex at .700. Cam by Jones Cam Designs in North Carolina L/C 112, Intake C/L 108, Exhaust C/L 116. Duration at seat 344/in, 348/ex, dur. @ .050 291/in 294/ex. Lift .771/in .770/ex. 1.7 Jesel shaft rockers. 4/7 swap cam. Peak torque 706.3 @ 5600. Peak HP 915 @ 7500. Was at 900HP @ 6900 and we spun it to 883HP @ 8200. Made 900HP to 7900 then fell off. Torque stayed high 600's until about 7000. This setup is topped by Dart tunnel with two 1150 Dominators. Msd ignition 7al-2. Intake also direct port 200hp nitrous(didnt dyno with N2O). Whew... long winded but didnt want two leave anything out. Let me know if I did.