Only you can determine what is best.
Advertised Horsepower is--165HP @ 3800 RPMs.
190 horsepower
350 engines from that year were available from 295 to 370 horsepower.
A 350 Oldsmobile engine has a different bolt pattern than the Chevrolet engine. The 350 Olds and 350 Pontiac engines have the same bolt pattern. The 350 Chevrolet and the 350 Buick engines have the same bolt pattern. Unless you have a dual bolt pattern transmission (there are some out there) in that Chevy, the Olds engine won't bolt into the Chevy transmission.
Only if the transmission has a dual bolt pattern. Chevrolet and Buick 350 engines have the same bolt pattern. Oldsmobile and Pontiac 350 engines have the same bolt pattern. There were some TH 350 transmissions that have dual bolt patterns.
200hp
Means it's a 1975 350 for conv. cab. 165 horsepower with 4 bolt mains.
200 hp
235 hp
200hp
Around 200 hp
The base horsepower on the Chevy 350 cubic inch engine is about 350. It is variable in its variable in its different incarnations.