What are these two plugs?

ditto on the convertor bushing unless you want to run it for a week without it to get to school. I ran it for 3 months like that without a bushing (68 318 on a 65 273 trans) and it finally cracked all 4 flex plate ears. The 68+ crankshaft convertor register is physically larger ( 1/4" total IIRC) than the early crank registers so the small convertor snouot doesnt center exactly and the slight difference is taken up by the flex plate ears until they finally crack .