Blade baits is a loose term and can mean a few different things (spinnerbait, Silver Buddy style lures, and Fish Head spins).
I fish my spinnerbaits on a MH-MF or MH-F action rod, around 7'. At least 14lb. FC or 40lb. braid.
Silver buddy type blade baits I prefer to use on spinning gear. 2500 size reel, 7' M-F rod. I'll use 7-8lb. FC for this.
Fish head spins I throw on casting gear, generally a slower ratio because I prefer a slower reels honestly (5:1 or 6:1). I use a 7' SC Avid M-F. For heavier fish heads in deeper water, I'll use a Zodias 7'2 MH-F rod.