You can get away with a little bit more duration; compression is on the low side to go crazy. I'm liking the Crower 00484 for this one. Duration @ 050 jumps up to 230/236 but it also spreads out the lobe separation to 114 which will keep the idle from getting out of control and widen the powerband. The 545 / .555 lift is going to open up those AFR heads nicely. Keep in mind, you are going to need lifters, springs pushrods etc to support this. You'll probably have ~ $1400 into the upgrade all said and done.