Read me!!!!!!
#7
You cant tell a 305 from a 350 by looking. Cant really tell anything by just looking at it as far as good running and the like. but you can get the casting numbers off of the block and look them up. that should tell you what it is. they are located on the on top of the motor by the fire wall behind the valve cover. you will probably need some degreaser and a strong light to read them.
I would pick the 79 for me just because they are harder to find.
#10
Also, tiny images are tiny. It's impossible to make out much detail from those.