The best way is to weigh the car with driver and then take it to a dragstrip and run it down the 1/4 mile. then use the formula hp=(.00426xmph)x(.00426xmph)x(.00426xmph)xweight.
Freshly rebuilt with good carburetor at 5000 rpm, 200 horsepower maybe a little more
V6 engine - 210 horsepower , V8 engine - 315 horsepower
Their are very few physical advantages of having a rebuilt engine. The only actual advantage of having a rebuilt engine is that it is much cheaper than a new engine.
The horsepower on the 1988 Mustang was # 90 horsepower 2.3 liter engine # 225 horsepower 5.0 liter engine
225 horsepower - UA engine code or 250 horsepower - UD engine code
A general rule is the bigger the engine, the more horsepower.
A 5.8 liter engine should have around 210 HP unless it has been rebuilt, bored out, ect... I have a jasper rebuild engine and they say it is slightly more than the factory HP of 210 HP
A Mazda B2200 engine with carburetor has 85 horsepower, and with fuel-injection has 105 horsepower.
the horsepower of a car depends on the number of cylinders it has. The engine displacement does not affect the horsepower of a car by much.
The standard horsepower of the Chevrolet 6.0 liter engine that comes in the Silverado is 360 horsepower. This is a V-8 engine.
Jasper
The Corliss engine could produce 2,500 horsepower.