Deeping Rangers manager Michael Goode was “absolutely delighted” after knocking out higher-level opposition for the second time this season.
They followed up the 1-0 victory over Ryman League club Dereham Town with a thrilling 4-2 replay win over former Conference club Leek Town on Tuesday night.
Deeping collected £3,000 prize money and set up a home tie in the Emirates FA Cup second qualifying round with AFC Rushden & Diamonds a week on Saturday.
Goode said: “I thought we deserved it.
“We went 1-0 up and in the first half we matched them in every department.
“At half-time I told the lads that we needed to be more patient in the final third because we had created a lot of chances.
“I’m disappointed with the way we conceded both goals but the manner in which we responded after that was brilliant.
“This is one of my best nights in football, playing or managing.
“Leek are a good outfit. This is definitely no fluke. I thought both teams played well but we played better.
“You want chances to fall to Scott Mooney in the box and you want Scott Coupland to run through like that. It was a calm finish.
“Jezz Goldson-Williams has not played much so far this season but his attitude has been brilliant. He has never moaned about being on the bench and when we brought him on he produced a great finish at the end.
“We haven’t had any easy draws to get this far. Boston were on top of the league and we’ve beaten two teams from Step Four.
“Now we can look forward to playing Diamonds in front of a bigger crowd.”
Jack Cotton will be back in the Deeping squad for Saturday’s home game against Rothwell Corinthians in the ChromaSport & Trophies United Counties League’s Premier Division.