I only know personally one person that has a demon carb, however it is a 1050cfm on a 454 drag car..lol
Glad to hear you like the street demon. I think the 525 is a road demon. They don't list it for sale, but deez performance has it for 365$

 

Oh, my bad. I thought you were saying they have a 525 Street Demon. Sorry.

 

If you've got some money burning a hole in your pocket then Quickfuel makes very nice carbs. I've got a DP on my Mustang and it's crisp. My buddy's got a vacuum secondary with a choke on a SBC and he said it's the best money he's ever spent on his Z28.

 

I've got about 7k burning. Deployment money.
I'm rebuilding my motor and transmission and then getting a 4banger vehicle.
Quickie had a 580 as the lowest c.f., I believe. It's the hr series. I really like the black carbs people have now a days, but that's 600 cfm. I'm looking for around 5 that's new. Yes the old as dirt holly 500 is great, but it's been on everything since the model a.