UBEC for LST2 Brushless Conversion

[Robl45]

Can someone help me out on what amp UBEC I would need for my LST2 brushless conversion. I was using the receiver pack to power the servos but in the 2 years its sat in the garage, the receiver pack is now not holding voltage. Rather than replace that old outdated POS, I figure i might as well power from a BEC off the 6S Lipo. It has stock dual steering servos and one servo doing the brakes. Would a 3 amp UBEC do the job?