Idle solenoid for Thermoquad question

Merry Christmas 4spd !!! 71 440+6 ! Only thing odd is the round head

69-1/2 440-6: DR1114420 (hex head)
70 340 4 bbl: DR1114442 (round head)
70 340-6 and 440-6 and hemi: DR1114429 (round head)
70 440 4 bbl: DR1114421 (hex head)
71 440 4 bbl: DR1114447 (hex head)
71 440-6: DR1114443 (hex head)