Demon carbs

My dad bought an 850 Demon from Jefferson swap meet here in Wisconsin for i believe $150 bucks around 2009, it sat in a plastic bag until 2014 when put it on my 360 and sucker fired right up! Ran awesome! Then my brother got his 408 and bolted it on man it woke that sucker up! The old 750 ran 12.00s and we put that never opened it and bam 11.89! They work damn good imo.