moving things for 20's

do you need to relocate anything to bag a 91 b2600 on 20's like the clutch master ,or move the booster just looking for a little heads up before i start thanks

I would consider getting a smaller Brake booster, 7" to clear the 20's, and You'll have to move the Clutch master because it definitely wont clear either. You might want to consider some tubular control arms if you plan on layin' 20's up front as well. or you have the option of notching your stock lower arm, removing the Tension Rod and fabricating a Support on the backside to make up for that lost support, and re-angling your upper arm a few degree's. hope this helps.