Here's a picture of a BOPC TH350 connected to an Olds engine and a Dual pattern trans:
Interestingly, I've seen a factory dual pattern Manual housing within the last month.
Manual transmission bells:
Buick bell (cutout for starter on passenger side only) with a GM manual trans pattern on the back
BOPC bell (has cutouts for a starter on both sides of the bell) with both a GM and Ford manual trans pattern on the back. The GM pattern has the 4 bolts in it.
Buick 215 / Rover Bell
RoverLT77bellhousing_zps6770580e-1.jpg
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