two subjects:
i took off the question mark shaped  elbow that holds the thermostat. now how do i get the thermostat out w/o damage to the thermostat?  its &amp;quot;stuck.&amp;quot; how do i know if the thermostat is good or not? there is a big hole into the block and a small hole for the h2o. where do they go and why two holes? am i right that this is where hot h2o returns to the radiator? is the big hole from the block and the small hole from the head?
i have asked similar question before on this site. what is the easiest way to determine if a rusted up repainted (with a brush) fleetline is a super 77 or not. mine is a row crop gas with the 3/4 inch threaded bolt holes in the frame pads. is that all i need to be sure? what is the bore  and rpm difference between a 77 and a super?