The number on the side is the right one. A good parts store might be able to check it for you. Is the Holley a progrssive, like half a 4 bbl, were you have a primary and a secondary throttle. If so save it other wise find out what it is and,,, Some holley 2 bbl were real monsters.
Larry
68 C20 327/465 daily driver 4:56 och!
63 C20 292/420 Camper truck Detroit Locker 4:10 posi
65 C10 ? /powerglide Custom Cab AC,PB,PS,4xflash