yes i am, the block i have been using has 3/4 hard fill std caps ,stud top and bottom with comtic gaskets the car and driver goes 3550 lbs and has run 140 mph on nos,i think the power around 700 hp from memory ,a mate had single turbo 408 std block ran around 8.50 at 168 mph elderbrock heads 3200 lbs his 900 hp range for 4 years and broke arod and destroyed the block, turbos are hot hash on the engine .thanks ian