Largest SB Hyd. Cam with Stock Springs/Rockers?

If the springs are in good shape and are stock springs you can get away with about .450 lift or thereabout. Try a speed pro #cl1143r and you will be very pleased with the results. You will need a good dual plane that breaths and a 750 on top. I'd recommend a 2800 stall, but I drove mine with stock converter and had lot's of fun. then when you want more, go to a 1.6 rocker and new springs and it will really wake you up! good luck.