Yes, some, remember .030" is a spark plug gap, and that's not a lot
but it will increase the CCs of the cylinder, and the increase in piston
dia. will give more power, all things remaining the same, but with other
power improvements it will be even more. All that being said, the real
power increase will be with an increased stroke, the 1.6 L engine is a
stroked 1.3L engine, the difference is 1mm bore, which is about what
you are looking at with a 30 over piston, and an increase in the stroke
of 15mm, but the stroke gives about 30% more power than a 1.3.
Unfortunately the 1.3 cannot be stroked like that, and the 1.6 block
is about 1 inch taller than the 1.3 block, so if you are really bent on
more power, the 1.6 swap is a serious consideration
Happy Building
Wild