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I'm not sure about starters, but you will need a post-81 302 flywheel.
Until 81 they used a 28oz balance, 81-on was 50oz.
The 6cyl flywheel is a different balance to either of the 302 flywheels.
Also, the pedal bracket from 87-on, is different to the 80-86 version.
I think when the later one has been 'made' to fit, the result hasn't been very satisfactory.
Very important issue: You CANNOT swap flywheels or flexplates between a 300 and a 302. They will physically swap - they have the same hub size and bolt pattern. The 300 is internally balanced and has no counterweight on the flywheel/flexplate. The 302 is externally balanced and has a counterweight on the flywheel/flexplate.