Well, I have a calculator & I aint afraid to use it.
The 1mm overbore in an L16 pushes it 2cc over the limit & only the most pedantic would give you grief over that, but the L16 has a really oddball stroke length of 73.7mm. [2.901"]

If it were necessary to grind the crank, even to just the first undersize of 0,25mm [0.010"], then by offset grinding it by just 0.05mm reducing the stroke to 73.6mm will produce a capacity of 1631.5cc when the 84mm bore size is used, which would give the protesting enemy at the gate absolute conniptions. The piston crown will fall short of the deck at TDC by 0.05mm or 0.002" [thinner than a Tally Ho cigarette paper]

A further reduction in stroke to 73.55mm [0.15mm reduction] will produce a capacity of 1630.4 cc leaving a more comfortable margin of 1.6cc. The piston would fall short at TDC by a whopping 0.15mm or 0.003" compared to the stock stroke & this should still be achieveable with a first undersize grind of the crank. [depending on journal condition]

I suspect that this is all accademic however as I doubt that there are very many occasions when racers at this level suffer the indignity of an engine teardown for inspection & scrutiny.
Still, something to think about.