HELP = good clutch match for my '68 383 Barracuda 4 spd

going on second try to find one that matches up right - it's a '71 18 spline A833 and I don't know if that is the heart of the issue /if there is typically a prob in this setup that anyone has dealt with? '68 383 in a '68 barracuda that started life as slant 6, 3 spd. What I had in there when I got car was a clutch disc too large for the PP and causing noise along with worn TO and very worn pilot bushing....had to have brass bushing made - apparently input shaft had been ground for a chevy motor at some time. Anyone been down this road? Started out replacing TO, then Z bar and rest of linkage - found clutch issue and worn pilot bushing - now just heck of time getting right clutch package..any tips appreciated.