I have a 98 L31 that I'm rebuilding. I'm boring .30 over with the stock lowers. Looking to run a lt1 241 cam from a camaro with 1.5 rockers, ls springs and retainers. I plan to run the stock intake and upgraded mpfi injection. Looking to add a few ponies, but not street racing. It's going on a 98 2d Tahoe 4wd. Will I need to get a tune done or will the stock pcm be ok and what if any upgrade do I need to do with the torque converter.