Not to argue, but the 1967 MK-IV cars are NOT GT40's, they are part of the Ford GT family of vehicles.
why? they were not built in the UK, not by FAV, not built on the steel tub.
1966:
MK-II - P1046, P1015, P1016, P1047, P1032, P1031, XGT2, XGT1 = 8
MK-I - P1017, P1040, P1007, P1038, P1001 & P1029 = 6
1967:
MK-IV - J5, J6, J7, J8 = 4
MK-IIB - P1031, P1015, P1047 = 3
MK-I - P1020, P1042, P1026 = 3
GT350R - 5R539 = 1
regards
jim p