does looks to be a clean car , its not 100% mint , inner wing is goin to need work soon , but its still worth what you give for it , but its not worth 4k (yet anyway)
i have a 3k agreed value on mine and its been fully stripped painted and rebuilt (also never been welded and not a patch of rust at all) running coilovers big brakes fully mint interior etc , but i think that 3k is fair for that would'nt say it was worth anymore and i wouldnt pay anymore for it .
old cars are very hard to value as replacing/parts etc can vary so much or even not be availiable at all and things like cossie's and mk2 escorts etc have a proper following which also puts up the prices , nova dont really have this in as big of a way but its growing so i think the prices will keep goin up but it takes time and for the cars to become even more rare lol