Hi, I have received and rebuilt correct #93 heads for my '66 with man steering and no A/C. It has now a #92 and a #94 ,-I guess they average OK! I am removing the A.I.R. pump, and got a used alt. bracket. The dr. side valve cover has an oil cap with a tube for the hose from the Calif. air cleaner. OPGI shows a different oil cap for screw-in on a '66, a tall one. What was orig. on federal cars? and what other mods beside air cleaner do I need to do beside vacuum line plugging and timing adjust? Too bad I have rats too. Thanks everybody!