If the car has the original Rochester carb on it, the filter is inside it. Follow the fuel line to the carb. There you will see what looks like a large hex nut. Loosen that and inside there is the filter available at any auto parts store.
To get a 400 Pontiac Motor in 1979, you had to also get the 4 speed. Pontiac last manufactured 400 motors in 1978 but saved some from 1978 for use in the 1979 model. Those motors were used in the 1979 4 speed cars only. 1979 Automatics had the Oldsmobile 403. You could also get a turbo version too. All of which could come with auto trans. I worked on many of these at the Pontiac dealer.
The possible reasons why your 1979 620 Datsun may backfire pass 4000 RPM's may be because because either, you need to replace the fuel filter, clean the fuel injectors, run supreme gas( due to age of the car), replace spark plugs, ignition coil may be disconnected, ignition rotor may be scarred (about a $5.00 part)and need to be replaced, replace pcv valve ,replace air filter or timing may be off. See available supplemental information regarding engine diagnosis at related link.
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