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Re: Carb swap
Edelbrock or Holly, they both need "adjustments" to perform well accross the board. Specific tune kits are available for both so whatever brand you are most familiar with, go for it.
Me, I use Edelbrocks as to me they are simple, basically Carter AFB, but on modified motors I use tune kits with assorted jets, metering rods and step up springs to dial in.
IMHO regardless of carb brand, get timing nailed down first before making any carb changes. This would be not only base (no VA) then all in, 2500-3k rpm, then finally with VA. The VA will often need adjustments on its own using a limiter plate and ideally an adjustable VA can. Always use manifold vacuum vs ported vacuum feeding VA on dizzy.
not using VA on a street car/truck will have part throttle drivability issues, poor mpg and rich part throttle operation.
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