As Jim stated the TO cover is for 2v and 4v Autolite carbs with an auto. trans or manual trans, however the TN is for both 2v and 4v with manual trans only. While Ford service specs for '66 list them for FE motors (352, 390, 428), the '65 service specs list them for 289 applications. The TN unit would be the correct cover for your carb (listed as applicable to carbs C5ZF-C, E or J). One correction per the '65 service specs, the C5ZF-C (as well as C5ZF-E), is listed for a manual trans 289 with a PCV system. The C5ZF-J is listed for a manual trans 289 with road draft.