Help me pick a cam

About the biggest you can go on stock springs is a Comp 256xe or 260 magnum or an equivalent. I don't know how much cool sound it'll make though cause it's not really very big but it should make a little noise. You really should consider replacing the springs though. Those 20+ year old springs are probably almost shot now and if you put a big cam on them they'll fade away real fast. Then you'll have a big pig with a cool sounding cam that won't spin over 4000 rpm. Single springs don't cost much.