D4b or not to D4b

What are the gains on a 64/65 273 if I swap out to an edelbrock D4B?
Engine is rebuilt with correct 64/65 stock 4bbl intake. Paperwork said it has an "rv" cam.
Car is just going to be a cruiser on weekends and to shows.
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I recommend using this carb gasket with the D4B intake...

It keeps the split plenum all the way to the carb for strong low end signal.... Plus it's 5/16" thick and will help insulate the carb from boiling the fuel/vapor lock... Comes with the studs and nuts also...

Edelbrock Heat Insulator Gasket