OK, I probably made a mistake when I bought the Speed Master cast stainless rocker assys. couple years ago. Now have them installed in the 427. I have corrected machining errors and other quality problems that could be corrected by machining. I have good geometry, rocker spacing and so-forth. Using comp. 282S cam, around 125 seat pressure with comp. recommended springs. Street use only but would like to "stand on the gas" once in a while! So the question is; just how bad are these damn things and what chance do I stand for a good outcome?