Slant 6 HEI

hi there friends I have used HEI systems on my projects. i am looking for any thoughts on a 1 piece HEI (coil in the cap) for my 70 Duster 225 project. have seen a lot of discussion out there on different types, but do not want to run a separate coil. anyone try this recently with current suppliers that generated a good result ? thank you for any thoughts !