Which heads on 1994 magnum block

Which pistons are on back order? I have KB107 pistons in the 2000 360 magnum engine thats in my 91 dakota sport..I went with trickflow heads and PRW 1.6 Rockers. Also used 3/8th Smith brother oil through push rods. The crank and rods are stock
The speed pro h116cp standard bore. Thought about the kb107 but heard that they had some skirt issues, and the speed pro are close to being stock weight.