Use this Summit cam kit, 15% off Summit brand parts. This cam is made by Crane and works. I've used it many times. Summit Racing® Cam Kits SUM-K50052
Buy Trick flow springs, they drop right in and are inexpensive. If your 302 heads have rotators on the exhaust valves buy 8 exhaust valves and get a valve job done. Post a wanted thread for 8 OEM retainers. Trick Flow® by PAC Racing Single Valve Springs TFS-16901-16