t-5 swap help

[1957project]

I'm installing a 1992 s10 t-5 in my 1957 chevy 3600 with a 235. I've cut down the input shaft and the sleeve the throw-out bearing rides on. The clutch disc I'm using is from Speedway motors part #91015649. The problem I'm having is the clutch disc is stopping the transmission from sliding in all the way. The splines on the tranny don't go back all the way to the sleeve. Will the astro van clutch disc fix this problem? The stock disc had an offset, dose the astro also? Any pics or info would be a huge help.