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We pulled out 2 degrees of initial timing and dropped the jets to 80 primary and 84 secondaries. The Rat put down 507 HP at 6,000 RPM and 471 lb-ft at 4,100 rpm with good air fuel ratio and lower EGT's. That is nothing to sneeze at, especially for a street car engine. Also, if you look at the torque you can see we had 453 lb-ft at 3,500 and it didn't dip below that until 5,900 RPM so this thing has a nice flat torque curve that should make a heavy car like a Chevelle pull like a freight train.