I got a 625 cfm Carter AVS for $80 off of eBay and rebuilt it with a kit from Mike's for $40. I just fired it up tonight on top of a standard Performer intake and it works great. 85% of a new Thunder AVS for a third of the price. Stupid easy to tune too.

1967 Dodge Coronet Deluxe station wagon

1.03" T-bars, QA1 arms/rods, Cordoba/GM Metric/Volare brake & knuckle, XHDs, Hellwig rear sway, 318 Magnum w/ air gap, 727, 3.23s