Edelbrock Air Gap Cheap Knockoff

DartGuy67 said
Anyone tried one on a 273 4 barrel? It will be stock w/ mildly cleaned up ports on 920 heads, manifolds and a cam similar to the e4. 3.23 gears and a 2200-2400 stall. Choosing between one of these, or a stealth manifold

Airgap works well on my 289 Ford. At the time of purchase the Performer carb was available. Going from a 2V to 4V. Airgaps do not have water or exhaust crossover to heat the manifold to aid vaporization of the fuel. With that in mind, I would chose the AVS2 650 or an annular booster Holley. The AVS2 come with annular primary boosters and a different initial calibration that compensates for the ethanol fuels.
Performer carbs can be converted easily to the annular boosters from the equivalent sized AVS2 carb. The Performer 600 can use the AVS2 650 boosters. Get ahold of The Carb Shop in Minnisota. If your Performer has not been tuned for ethanol content fuels, also get the equivalent AVS2 calibration kit. Ethanol in the fuel requires an air/fuel ratio, for cruise, closer to 14.1:1, so a carb tuned for 14.7:1 AFR needs to have the jets and metering rods changed. Reading plugs or an O2 sensor and gauge is required.
The annular boosters provide better atomization of the fuel leaving the booster, which exposes more surface area to the air to vaporize. Nonvaporized fuel droplets are smaller and more vaporizes during compression as compared to those from conventional boosters.