looking for power brakes advice, inline 250

[Scottcoda]

I have a 68 GMC 3/4 ton with a inline 250 running a Clifford intake and holley 4 barrel ( stock cam), I am getting ready to do my front disc swap and collecting the parts I need, I am considering upgrading my brakes by adding a 8 inch dual diaphragm booster, I was curious if this is a difficult install and where would I run the vacuum line?? I think that the vacuum hose ran to the stock intake on factory power brake inline 6 trucks . I am prob going to buy my M/C set up from CPP or Performance online, or if any one can recommend any vendors please do..
any info on doing the upgrade would be awesome.. Thanks to all..

BTW the donor truck for the front end disc swap was a 1987 Suburban 2WD 3/4 ton truck if that has any bearing on I might need to do for power brakes