That would be depend on if the magnum needed that too! Anytime you buy a used junkyard engine there is a chance it will need bored bearings etc . I am on the lookout tho. Hp wise are magnums easier to make power?
a stock magnum from the factory will have more hp and torque than a stock LA 360 from the factory. A lot of my engines have come from vehicles that I bought really cheap due to poor condition, but had excellent drive trains.
For examples, one time I bought a '89 maxi van with 360 for 300 bucks that had a excellent drive train with 116,*** miles. Drove it about 40 miles to get it home. Another time I bought a rusty rusty late 70's dodge truck for 200 bucks, with an excellent running 318. Drove it almost 1 hr to get it home. And can't forget the 318 diplomat police car I got for 100 bucks, drove it home after I put air in the tires. These are just a few examples of only some of the cars I've bought and stripped.