Cam up my 318, help me chose!

Hello eveyone!

I need help on a Cam choise. Im drivning a -73 Duster, with a 318 stolen from a 85 van, it got the stock cam in it. Oderwise its 302 heads, Performer intake, Holley 650 vac carb, Accel coil, Tti headers and a 2,5 double exhaust. Behind it sits a 727 and a 8.25 with 2.76 gears...? I plan to change gears to 3.55 and a sure grip. Also maybe a higher stall converter. Im thinking about a Hughes Whiplash or a Comp extreme energy of som sort. Im quite lost about camchafts, and the car is quite a dog. please help me choose right one. //Henrik