There's no such thing as a 1966 paratrooper. It's a 1966 military SKS that has been chopped and shortened in the 80s/90s.
Paratroopers have no collector value above a standard SKS, unless it's a special model.
However, the masses who drink the kool aid about paras being some special gun, seem to greatly overpay for them.
IMO, and standard paratrooper is a $350-$400 gun. But people do pay up to $600 for them.
So the dealmaker with your proposed trade, is just finding someone with a 308 that they feel is an equal trade.