Gosport Borough's chairman Mark Hook says Sunday's FA Trophy final against Cambridge United will secure the club financially for the next three seasons.
Gosport take on the U's at Wembley in what will be the biggest day in the Conference South club's history.
Hook, whose association with the club began as a programme seller in the 1980s, added it will be a surreal moment to see them play at Wembley.
"I'm proud of my town and what the club have done," Hook told BBC South Today.
"It's a surreal moment I have to say, who would have believed we are going to Wembley? It's a great feeling.
"I'm just delighted for all the volunteers and the staff, the players and supporters of Gosport.
It's a once in a lifetime opportunity and we are really looking forward to it."
Hook, who became chairman in 2009, says that, despite the financial boost of reaching the final, they will not be reckless in their pursuit of glory in the next few years.
"It will make Gosport financially secure for the next two or three seasons," he said, "What we will do is make sure the money is not frittered away.
"There are certain ground improvements we'd like to see and, likewise, with the squad. The money will be looked after and we won't go chasing the dream like so many clubs have to get to Conference South.
"It's a great day out but we have to make sure Conference South survival is our main aim."
Gosport striker Tim Sills, who scored two goals in the semi-final second leg to help seal a place in Sunday's final, has played against Cambridge United before.
Sills, 34, scored in Torquay United's play-off final victory over Cambridge at Wembley to send them back into the Football League.
Sunday will be his third appearance at Wembley after being part of the Torquay United side defeated by Ebbsfleet United in the 2008 Trophy Final.
"I've lost in the final before so for me, personally, it will be nice to banish that memory for ever," he said.
"For a club like Gosport to win against a club like Cambridge, who are a league above and going for promotion, would be an even bigger achievement."
And he has called on his side, who are 20th in Conference South, to evoke the spirit of Wimbledon's famous 'Crazy Gang' who defeated Liverpool in the 1988 FA Cup final.
"We have a lot of quality and on our day we are a good side," he said.
"In games where you are the underdog you do need that spirit almost like the Crazy Gang spirit as Wimbledon used to have."