tbar,i looked at cam-quest6 for a cam that migth better fit your combo. comp cams xs290s is the best solid i found .they recommend 3500 stall and 10.5 compression, which would work with what you already have. it would even be streetable and you could probably reuse your valve springs. no head machining necessary either( around same lift as the old cam). i know you would prefer a solid roller, but you could just slip this one in and it would improve torque a bunch and probably hp too. both of which should improve your 60 foots.but, if it was me, i would fine-tune the advance curve in the distributor( locked-out?) and tailor the carb`s accelerator pumps before the cam change.