800cfm on mild 360 ?

I had picked up a dbl pump Holley at a swap meet, didn't recognize the number.
I brought it home, cleaned it up, checked it over, and found it to be an 830 cfm, never had one of them.
I replaced the 780 on my son's 340 with the 830.
My son came home from work, later took the Dart out, and about 5 mins later, he was back.
I watched him go and open the trunk, then go and open the hood, then he started walking up to the house.
I came out on the porch, he said "I don't see a nitrous bottle, what'd you do."
"Bigger carb"
He gave me a thumbs up, got back in the car, and away he went.