210 hp and 340 ft lbs of torque according to haynes manual and chiltons.
230 HP 230 HP
The 454 LS7 crate engine sold by GM is rated at 500 hp.
250+ hp
If you have the money, you can do anything They do it all the time. 600+ HP.
Advertised HorsePower is stright out of A CHILTON manual: And it says that the 1981 454 truck Engine With a 4-barrel has 210 HP. @ 3800 RPMs. The 1985 and 86 year 454 had 230 HP. @ 3800 RPMs. From 1984 down to 1979 454 engines had 210 HP @ 3800 RPMs.
The 1973 model 454 had---250 HP @ 4000 RPM with a 4- bbl carb. After 1973 the horse power went down about 10 HP before 1973 the 454 had 450HP so Chevy said. the 454 actually had close to 500HP
Changing carbs probably wouldn't add much if anything, but headers and dual exhaust could give 10 hp.
290 HP
There was 2 different 454 in 1974 , One had advertised 230 HP@4000 RPM And the other had 250 HP@4000 rpm
210 hp
You cannot just convert Cubic Inches to Horsepower. Take the 454 you are referring to. When this engine was produced it came with different horsepower ratings depending on year and what vehicle it was installed in. The 454 in 1970 cranked out 450 hp in LS6 trim. The LS5 version of this engine only produced 390 hp the very same year. Same 454 engine but 60 hp difference the same year. You would have to know the year and what trim the engine was to know the actual hp.
There was 2 454 BB chevys in 1973 One was--240 HP@ 4000 RPMs. 4BBl carb. The other was--250HP @ 4000 RPMs. 4 BBL carb.