All the carbs will function well when tuned on the engine. T quads have long been out of production and finding one that is serviceable may be difficult.
Rochester bolt on the same manifolds and Edelbrock has new reproduction carbs available. The Rochester triple booster on the small primaries provides good fuel economy at low speeds.
The Edelbrock AVS2 carbs come with annular boosters on the primary venturis to aid atomization and economy. Very beneficial on an airgap style manifold.
Personally I would go with the AVS2 650 CFM, and second choice would be the Rochester style Edelbrock. Once you get either dialed in, just forget and drive.
