I use hydraulic clutch and slave, usually a Wilwood setupo and -4AN line and fittings. Don't know poop about chebbie bellhousings, I'm a Ford guy but there was a zillion chebbies came out with Muncies. Personally I spend a few more bucks and always use a scattershield. Far as I know, all the chebbie pilot bushings are the same. Clutch depends on how hard you're going to beat on it and what flywheel you want to use... I use McCleod clutches and flywheels for the street and for racing.......

PS--If you don't already have a 4 speed, might want to consider a 5 speed, either a T-56 or one of the TKO's, then the shifter is a rail shifter and has multiple positions options and is on top of the trans.....