when i was doing newspaper work they always asked for rc glossies for reproduction
but i these days it doesn't matters that much. glossy rc is really reflective,
but just the same i haven't noticed a difference in what i make in to 0's and 1's
as for blurp
just scan deep fix to make it look like your print. and then rz down to whatever it is their program asks for.
make sure you save it the way they ask otherwise it will not look right ...
have fun !