Well I'm having my heads resurfaced because a couple of weeks ago stuff got realy f'ed up(.008" warp). Anyways I was looking at doing some full rollers, new springs rods aand lifters. Guy at the machine shop recomended drilling the rocker mounts out to 7/16(?) and then getting adjustable rockers. Also double coil springs(requires more machine work). I don't feel as if I need this becuase my car is an occasional drag car. Maybe once a month at best. Mostly just a DD. Should I just go with a stiffer single springs and some 1.7 full rollers?