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)

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

Carburetor Spacer - 4150 / 1.00 4-Hole Tapered – Wilson Manifolds

Spacer will increase air speed from the base of the carburetor to the top of the intake valve and will end up pulling more fuel from the carburetor

HVH Super Sucker 604 Carburetor 4-Hole Spacer, 5/8 Inch

Pit Stop: How Carburetor Spacers Affect Performance

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Carb spacer review for the carb guys out there?

Carburetor Spacers - Make Room for More Power

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Free Shipping - Hamburger's Performance Torque Flow CNC Carburetor Spacers with qualifying orders of $109. Shop Carburetor Spacers at Summit Racing.

Hamburger's Performance 3219 Hamburger's Performance Torque Flow CNC Carburetor Spacers | Summit Racing

Best carb spacer for a 602

Carburetor Spacer Plate - 4V - 289 / 302 / 351W - Used ~ 1967

Cam swap/Carb tuning : r/EngineBuilding

HVH 1 Dual Plane Intake Manifold Carb Spacer for 602s, ST4150-2AL

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RE Suspension TAPERED SPACER 5/8 X 1 LONG STEEL - WM-625100T

4500 Carb Spacer - 1.50'' Tapered Lightweight (2'' Bore)

Horsepower reduction spacer Carburetor Spacer, HP Reducer [ 7227N ] - $145.00 : BLP, Xtreme Performance Made In USA

Replacement Thru Axle Spacer for Syntace Axles - Burley