You can't go wrong with the JBA silver ceramic 1653S for your '69-70 with a 351W. They go in easy without fitment problems even if you're running a 4-speed. They also sell an H-pipe that works great. You will need to get a "drop-down" bracket it you've got power steering. Their website recommends using the JBA z-bar, but I'm using my original z-bar with no problems.
Stu