What Nikp said above... x2 good info-
copy and paste from what I posted a few years back.
What I did.. i have the sbc setup and had to pull my motor several times before I got it right.
Chev clutch disc splines are cut different than a Toyota . (The difference is straight cut splines on the chevy verses an angle cut spline on the toyota.
I tore the center hub out of my clutch because it had worn on the input shaft.)
I tried a Toyota disc( with rubber instead of springs) and the inner hub would rub on the pressure plate. ( It was facing the correct side)
I had a toyota ( spring type) splined inner Clutch disc hub mated to a chevy clutch disc. Custom deal but no problem for any good clutch shop and same price. I used the chevy diaphram type pressure plate becasue it takes less throw from the slave to operate and chevy T/O bearing. I also used a curved cast clutch for to get the position closer to the slave as I used a AA slave bracket on the Chevy. Make sure you have good tight connections and no free play, with a good strong clutch return spring pulling straigh back perpindicular wtih the fork. it will save you alot of time. Ask me how I know.
Like I said ... I researched the lcml archives and found a zillion opinions. I have run into tons of chevy guys that are always crawling under their rig and fiddling with the cluthc adjustment. It just made sense to me to use the Toy center splined connection hub on a Chevy outer disc material.)
What I forgot to do was put in a new chevy ball pivot $10 on the inner bellhousing. Mine was worn and caused lots of end play when the fork would pivot and try to "walk".
Ball Pivots wear and cause longer throws than needed, small Item that gets overlooked. You need all you can get .. I have seen many a sbc conversion throw out bearing spinning away cause they are too close to the clutch fingers and touch and begin to spin and sing to you.
Lastly I used a pre 69 brake master cylinder ( as per Mark Whatleys years of experience ) to give me longer slave throw. Pre 69 Brake master( yes brake master cyl( bolts right up and to the clutch mount .THe diameter slightly larger than the slave diameter resulting in about a 1/2" more throw when the pedal is depressed.
post 4,5,6 is helpful tooo
https://forum.ih8mud.com/40-55-series-tech/255044-sbc-sm465-clutch-question.html
