It is my understanding that in '64 only, the Chevelles & Chevy IIs with the 230/155 had chrome accents (rocker cover, oil breather, dipstick handle, air cleaner lid). Does yours? Also, do you have coolant lines from your Powerglide to the lower rad section? The base six did not (194 from '64-'66; 230 from '67 - '69). My 250 has an external cooler, but I'm not sure if the 230/155 of '64 or the 230/140 of '65-'66 used it.