How come no A bodies on Graveyard Cars

I'd imagine several factors. We do have a member with an a57 69 'cuda there and it has been in the show but...

if you notice they replace a lot of parts especially body panels and a-bodies are very limited in the repop parts that are so far available.
many B and E-bodies have better market value so they are easier to put money out and still have room for profit.