This is a vacuum advance that fits a lot of v8 ford. Including but not limited too

1971-1972 F100 302, DISTRIBUTOR ID# D2OF-EA, D2UF-GA,HA,MA

1973-1974 F100 302, DISTRIBUTOR ID# D3BF-BA,DA

1973-1974 F100 360, 390, DISTRIBUTOR ID# D3TF-UA, EXCL ELECTRONIC IGNITION

1970-1972 F100-F350 360, 390, DISTRIBUTOR ID# D2TF-MA