Why do you think you need a larger MC ?

A larger MC is only needed when you make a major change such as converting the rear to disks. A larger MC on a stock system is not going to improve anything. On my 84 I have larger calipers (IFS V6) on the front and larger drums on the rear (87 IFS rear axle) and the stock MC works just fine.

- seen in FOUR WHEELER mag July 2006 & OFF-ROAD mag Feb 2007 -
'84 4Runner ARBed 5.29s F&R,4.7 & 2.28 t-cases,hy-steer,BudBuilt skid,30spl Longs,36" TSLs,Chevys

'83 P/U, Buick 231 V6,Holley 4 bbl,Weiand intake,Downey headers,TH350 w/700R4 gearset