Switch to Full Synthetic Oil

I started my rebuilt 340 and changed the oil on regular break in schedule 10w 30....I now have put about 1100 miles on the motor and was thinking come spring I would change it out and fill her up with 5w 30 Castrol full synthetic..

Does anyone see any issues with this?

Is it worth doing this?

Any better full synthetic I should be using?
Author: admin