The distributor and balancer could have been added to a standard engine. To be almost certain you would have to remove a valve cover and see if it has valve spring pockets for stability and screw-in rocker-arm studs. They say the heads have a 19, 20, or 21 cavity number in the corners of the castings outside of the valve-cover areas on the exhaust side. Don’t know if this is true, or if you can see this area on a Tiger. If you have HiPo heads you probably have a HiPo, BUT to be certain you would have to remove the oil pan and see if you have 3/8″ HiPo connecting rod bolts, standard engines are 5/16″ Also HiPo’s have heavier crankshaft main bearing caps.