Frankenstein mismatch engine transmission combo need help

Help needed, I have a 1961 Econoline (irrelevant) with a 1967 mustang 200 I6 and 3 speed manual. I purchased a 1974 C4 transmission and C5GP-7976-A Bellhousing. I need help purchasing the flexplate and correct torque converter. I'm getting mismatch data off of the internet. I know the 70 up C4's have 26 spline. And which starter will be needed?
Thank you,
 
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