from memory i jacked a good 5" on the left, as there's less shit connected there.
that's plenty to get a brush in.
right is a bit harder,steering shaft as you said think i still had to get 4" to get all the blocks and bolts in, and i didn't even put them in the right place (
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bend up the bracket holding the vacuum lines to the hubs ( i bent mine up 2", which with extra hose was fine to jack the body 4" off the chassis but everyone's hoses are different just pay attention while jacking it and dont let them get too tight)
there's 2 lines coming down from the master cylinder to a cast ally block bolted to the chassey on mine, i unbolted it and let it go free, but you can gradually bend up the solid lines to that as it will be perminantly higher with a BL.
a lot of people re bracket it in its new higher position
if your putting in extended brake lines i recommend getting or borrowing a 10 mm flare nut spanner, the metal on the break line nuts is soft as shit. i had to replace a whole line because i fucked the nuts with cheap tools, cost me 40 bucks and had to replace the entire hard breakline. the line the rear right gets a bit tight if you dont extend it