George, my first pump gas stroker motor made 612 HP at 5600 RPM and 644 Ft. lbs at 4500 RPM, it was a 400 block bored to 4.375, I bought a Ohio 4.25 stroke crank for it and used a set of CAT brand 6.800 long H beam forged steel rods and s set of custom Ross 22 CC dished pistons that made a measured 9.25 to 1 compressio ratio. I use a set of big valve ported 906 heads that didn't flow very well and a Eddy low deck six pak intake and stock type vacume carbs. The cam is a custom grind Comp Cams solid roller that is 260 degrees at .050 I switched heads later to a set of Eddy RPM that I had MCH CNC port and that picked the car up .3 ET and 4 MPH in the 1/4 mile, that was proablly worth 40 to 60 HP You can make a big motor make big power easier than you can with a smaller C.I. motor BTW, you'll need a bigger carb also, big motors, high HP motors, need lots of air to make that power