I just put a 6-71 blower on my newly redone 383. All internal parts are high quality and forged. My compression ratio is about 8.1:1. My blower is giving me almost 5 lbs of boost when i floor it. Its fast enough for me and I'm more than satisfied with the power, but what do you think the "safe" amount of boost it would be able to handle for a daily driver? And also what is the absolute "safe" limit of boost would be to run it a couple of times at the track just to see what it can do? And also is there any other way to adjust the boost it delivers besides swapping pulleys? There is a valve (my engine guy calls it a pop-off valve, I've only heard blow-off valve but im sure the purpose is the same and maybe they are the same thing but hes a bit older and maybe thats just what hes used to calling it? i dont know) on the back of the manifold. I'm sure that could be adjusted?? I'm young and still learning so help me out!! thanks!!