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I was wondering what the spline count of a 305 5.0L SBC V8 along with the spline count of a TH350 and NV3500 5-speed manual? I am planning on doing a tranny swap and am trying to figure out some base calculations for cost and what all I will need. If you have done a NV3500/V8 swap please help me out.
 

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The spline count is on the input shaft of a manual transmission and matching clutch assembly. There is no splines on the back of any SBC crank that needs to be matched to the transmission. All you have to do is find the correct bellhousing to mate said transmission to a SBC. Get the matching clutch, find the correct size flywheel for the clutch size and go from there. Most car bellhousings will limit clutch size to 10.5" to 11". Some truck bellhousings will allow a larger clutch but might not fit your transmission tunnel.
 
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