66 Dart GT HT Whatsitgonnabe?

I just put my wire wheel to it and pulled the filler cap rubber gasket out which is actually in surprisingly good shape.

The cap has text on it and after reading a rather lengthy forum post I'm thinking it may be from '71 if the date code 221 means week 22 of year (7)1.

No idea if I'm correct and - frankly - not really concerned either.

With your info, Don, I think I'll try this without brake booster and see how I feel about it. If I'm not satisfied with the brakes, I'll get a VW master cylinder for a model with big brakes, like a Gofl GTI or a Passat.