hi and welcome..first thing to do is usual checks like any other car-hpi,google etc
then physically check the cars floor vin number is there-intact unaltered and that it hasnt been cut out@ welded in,check engine number also but on cossies/older cars this is often changed,so not a big deal unless massive ticket rs500 etc
if you are used to old fords you will be know stranger to rust-sierras do this for fun -everywhere