I use the Zoom brand clutch in my 78 400 4spd, summit carries them and some others, been 15+ years in use & works great on the street and some test & tune drag use. Pretty sure it was a 10.5" but a stock flywheel should only use 1 size so just confirm that size with the oreilys part. I used a Hays brand billet steel flywheel that I think accepts 10.5 & 11".
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