Well yes and no on the 200 hp, a 250 rated at approximately 116 hp and slightly higher in big truck engines in the late 1950s.
Okay so add the tri carb intake, headers/dual exhaust, high compression head, lighter weight 3 ring racing pistons, and you could climb to 175 hp and whole lot more torque, RPM and umph.
Now 200hp, might be a little tough on a mild build, going all out might not.
A 265 might yield this 200 bench mark a bit easier.
The type of build I describe on a 250 should be noticeably more powered then a tired stock 250.
Slant 6s can be made to go like a " bat outta hel", 11 second quarter mile cars are not outta the question, and a 1961 Dodge Lancer with a 225 hi perf engine taught a Hellcat Hemi a lesson on the strip, don't believe it google it on You Tube...
You wanna make power, seriously give George Asche a call, he will tell you the straight on this... PS waking your 250 up,in a mild build, will most likely give you all you want.