Should I replace the stock 360 intake?

Wouldn´t an spreadbore-adaptor plate hurt the perfomance gains of the Airgap?
A lot depends on the rest of the engine and drivetrain combination. There is also the lack of a choke well to operate the choke. Perhaps your engine set up will never require a choke?

If you need a operational choke, then there are these two options below. The TA was offered over the counter at parts stores with an electric choke & small primaries as well with ether a Chrysler or Chevy (pictured) throttle arm. There is also the older race versions with a bracket for a manual choke, both of those have the big primaries. Rate at a true 850-1,000 cfm.

Race version first, they also have a clockable throttle arm & will use a Rochester fuel fitting on the rear of the crab facing downwards.
Second, the electric choke w/a Chevy throttle arm.
These are hard to come by and there tuning kits are super hard to find as well as a bit expensive. You will still need an adapter for a squarebore intake. But it does solve particular problems.

It is difficult to get a stock carb to work with a choke cable. If you still need it.

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