Question on chassis

Well Im attending Job corps and taking automotive, i love this trade... but we are working on a project that our instructor has purchesed/set up for us. Its an old dirt racer chassis and we aren't 100% sure what it is. From all the numbers and everything we think its a 1972 Chevelle chassis but how can we double check to be sure? ill try to get some pics of it up.

post a pic...I make my living off of the 68 thru 72 frames. I can tell the diff between Monte, El Camino convertiblkes And the regulars ones