K-Member Dilemma

in my 69 dart im converting from slant six to v8 and am not sure what i should do for motor mounts. i also have a spool type K-Member from a 76 dart thats also for a slant six. im not sure if i should keep my original K-Member and use truck mounts with no modifications or try to use the 76 K-Member and move the one side mount to line up with my motor so i can go with the better spool type mounts. i know i can buy addapter mounts but im on a bit of a budget right now and i dont mind moving the mount on the 76 K-Member. the car should have a bit more than 350 hp. i just cant decide what to do.