What size brake lines?

[ltdmstr]

So I'm doing a manual to power brake conversion with hydroboost, as well as front disc conversion, on a '68 C10. I'm also replacing all the brake lines, front and rear. I did a search on here to see what size brake lines to use, and the results are just about every conceivable combination of 3/16 and 1/4 inch. Is there any consensus as to what size lines to use from the mc to the junction, from the junction to the front discs, along the frame rail to the rear flex line, and from the rear flex line to the rear drums? Thanks.