SB Timing Cover interchange???

MRL Performance said

upto 1969 the dont have the timing cast into them. After that upto 1992(318) or 1993(360) they are all the same.

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Actually, there were several styles. Look-up my post from a few years ago with photos of 4 different timing covers (most in my hands). However, I don't think 360 timing covers are different.