How to ID a 308 ?

Hi all, I’m going to go looi at a 51C6 coupe. The owner claimes it’s a 308, but he had no idea when I pointed out (from photos )that it has a 262 head on it. It also has Twin -H on it as well , with a 3 speed with overdrive. I’m going to see it in person on Monday. So if someone can point out what determines a short block/long block 262 and what determines visually a 308 block. I have many Hudson’s but I’m unfamiliar with the step downs. Thank you ,and of course I will follow up with pictures.

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