Carb spacer review for the carb guys out there?

How many of you fellow carb guys are running spacers? I've always wanted to try out one of those badass Wilson Manifolds spacers, but the prices always scared me off. Well turns out a local Factory Stock racer switched to EFI and sold me his spacer for $50 (which is brand new and was $140 new)

Street HP—Going Your Classic Holley 4150 One Better!

Fine Tuning: SBF Carb Spacers

Vacuum Port Adapter/Spacer, Aluminum with Pulse Fitting, Manifold

4150 Carb Spacer

Engine Masters - Will a carb spacer deliver more power? Find out

Tapered Spacer for 4150/4160 Dual Pane, 2 STL, F3D, 3MF Files for

Carburetor Spacer Testing – Eaton Balancing

Offy Manifold To Weber 32/36 or 38 Carb Spacer

Cam swap/Carb tuning : r/EngineBuilding

Spectre Performance 5764 Universal 4-Hole/Open