The red bike looks like a 1950’s Huffman, the serial number should indicate its year of manufacture. The model appears to be the economy model, not made to accept a tear-drop tank, based on the truss tube height (at rear joint).
The black bike has the Snyder Enterprises stamp, (and looks like a lightly stamped #2); the Bendix “Red Band” hub may also indicate a date range. The 1960’s saw many peculiar bicycle frames, some of which take time to get an appreciation for their styling.
The original poster might consider clicking the report button, and requesting that the site administrators move this thread to the classic bicycles or middleweights forums, rather than the forum for muscle bikes. I am not sure what a muscle bike is, but to me the only muscle part might be the handle bars(?). Otherwise, the responses might be solely focused on those handle bars.