1970 Javelin for Dad

Thanks I've been watching the one on e-bay for 900$ do you know what I can expect to pay for a 70? I think his had the 304 V8 with a 3 speed auto and it wasn't a AMX for sure I don't know if it was an sst hard to tell in 30 year old pictures and like I said I don't know much about javelins.