Changing carbs probably wouldn't add much if anything, but headers and dual exhaust could give 10 hp.
It does depend on the engine, but I'd shoot a little higher and say headers will give a good 15-30 hp 3 or 4 hp depending on the engine
195 hp for the 4.3 V6 295 hp for the 4.8 V8 315 hp for the 5.3 V8 367 hp for the 6.0 V8 403 hp for the 6.2 V8
Too many variables, could be less than 5 hp or more than 50.
if you can find the hp. of the eng., you can add between 12-20 more hp. for the headers.
There are too many variables that determine what hp increase headers will give. Engine size, carbed,f.i.,stock,hi perforforman ce,car weight,the list goes on and on....
260 hp
355 HP?
205 hp
383 Super Commando V8 - 335 hp. 440 +6 - 390 hp. 426 Hemi V8 - 425 hp.
From the factory, they ranged from 145 hp to 370 hp.
Depends on the car, the intacke system, and the rest of the exhaust system. Results tend to be better on large engines such as big block V-8's. Some small 4 cyl engines gain little to nothing with headers. Often they are not worth the money. Depends on the brand and how much you wanna spend on them. V8 can get short lenght mid leght or long tube and long tube will give you about 30 hp but that's with aftermarket exhaust. Short tube are about 12-18.