Old horse new beating cam question

If you don't want to change the springs, just keep the lift .450 or under, and duration 216 or less @050. I've done it many times before using the stock springs. Here are just a couple of choices among the many that are out there......


COMP Cams High Energy Cam and Lifter Kits CL20-210-2
COMP Cams Xtreme Energy Cam and Lifter Kits CL20-220-3
Summit Racing® Classic Camshafts SUM-6900
Crane PowerMax Cam and Lifter Kits 693902