I've looked up BR-319 on the web and as I speak portuguese, I found out that the govenment is currently paving about 730 km of that road.
The road is 860km long and it has 21km sealed (maybe more now). To get to it from Porto Velho, there is a ferry link across the river Madeira.
So, I guess the best information is local, check in Manaus when you get there. You can always take the boat to Porto Velho.
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