The Villagers host Bath City in the semi-final second leg knowing that victory will be enough to earn a place in non-League football’s showcase event.
Last week’s first leg finished 2-2 and with away goals not counting double, it is a case of all to play for at Church Road.
United manager Heath said: “It is a massive game as there is a lot at stake. It is big in terms of both finance and prestige for the club.
“For the players, it presents a great opportunity to reach and play in a final at Wembley. Both sides now know what they need to do. It is now down to just one game.
“We have to believe that we can win. We will be slight favourites as we have home advantage. Bath showed that they are capable of attacking and providing a threat and they will feel that they now have nothing to lose.
“However, it is our performance on the day that matters for us. We will make our usual preparations and, hopefully, produce a good and winning performance.”
North Ferriby are hoping for a bumper crowd with fans able to pay on the day. The winners will face Wrexham or Torquay United in the final on Sunday, March 29.