ECM and timing question tbi 350 motor

I am setting my timing (with the wire unplugged) @ 0 when in park idling. I found out my ECM/ Computer is from a 305 :( will it affect anything, or should I get the 350 computer and install it removing the 305 one. Thanx all

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Chevrolet
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depends on the year

Whitelightning

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Whitelightning

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