As I was goofing around under the hood of my 1978 Suburban yesterday I notice I had some fluid leaking from my master cylinder right where it bolts to the booster. Time for a new one! Since the master cylinders are so cheap for these trucks ($12. - $40.) and parts interchange all over the place, what would be the best option? Currently I've got the "standard" lightweight 3/4 ton running gear (d44 - 14bff) and I'm planning on putting disk brakes in the rear someday (when I have more that $1. in my pocket ). My initial thought is to find a master cylinder with the largest bore piston I can find and huge reservoirs. Is this a good idea, a waste of time or potentially dangerous? What about changing to the newer style master cylinder with the aluminium block and plastic reservoir? Is this a better design or a piece of crap? Will it bolt onto my booster? Ideas? Part numbers? General recommendations?