1963 Dodge dart convertible hydraulic clutch conversion

so the car now has a 225 with a four speed I went ahead and put the Z bar in all the mechanical hardware, but there isn’t room for the exhaust. The car has a Clifford split header would like to put a hydraulic clutch in at this point, but I’m not sure if I can do it. Most kits I’ve seen are for 67 and up. The collector pipe in 2 1/2 into 3” all the way out the back. I got the drive train out of a 64 and it ran well and sounds great. Advise will be greatly appreciated.