Could be vacuum module in distributor or other vacuum
The 400 in the 1979 F150 has a 2 barrel carburetor , so unless your willing to change the intake manifold to a 4 barrel manifold and get a 4 barrel carburetor , I would stick with original equipment
I would look at the number of barrels. If there is more than one barrel, you know you have at least a double barrel shotgun. If there are 1 or less barrels, then you don't.
That would all depend on the barrels height.
Sorry no, the intake manifold would have to be changed
In older cars 4v = a four barrel carburetor. 2v would be a two barrel and a 1v would be one barrel
That would be a Rochester 2-barrel are a 4-barrel Quadrajet. You did not say what size. This would not be what they call a FEEDBACK carburetor
Yes it could be done, but you would have to locate a smooth bore barrel to change it with. Remember smooth bore barrels are not as accurate as a rifled bore barrel.
It depends on which barrel you need. Light 12 barrels are more expensive than the standard weight barrels. Is your gun a Magnum? If so, a mag barrel would be required with a 3" chamber. Having the correct barrel address to match the date of your gun is also important. All of this said, extra barrels usually run in the $150 to $400 range for most A5's.
That would be a 4-barrel ROCHESTER 4MV QUADRAJET CARBURETOR. Unless... It's an L78 (solid lifter, 375 HP 396) then it would most likely be a Holley 780.
55 gallons A barrel as a unit of measure is 42 gallons for oil. When you hear number such as 1,000 barrels of oil that would be 42000 gallons.
probably not, historicly shotguns are smoothbore if you shoot a slug, THAT would be rifled.
"Best" is a very subjective measure. Barrels by any major barrel manufacturer or by Glock would not be a poor choice.