Hey, how is the car and engine going? The scat stroker rod is a good rod. i would go 6". Try a Mike Jones Cam Designs hydraulic roller. Pick a cam one smaller size than you think you need and you are on your way. Try one of their EHR designs and use their roller lifters. Careful here, you may think you can get away with another lifter. You can't. You must use their roller lifter with the high lift design and engineering and metallurgy that they use. These cams are the best street hyd. roller i have ever seen or heard of for a SBC.