HEI Distributor questions

halifaxhops said

Mopar Distributor Shaft Lengths
Mopar Distributor identification guide by measuring shaft length, measured from mounting surface to lower end of distributor shaft.

Mopar LA engine – 3.875”
Mopar B engine – 3.5″
Mopar RB engine – 4″
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Chrysler 331/354 Hemi – 4.25″
Chrysler 392 Hemi – 4.5″
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Dodge 241/260/270 Hemi – 3.875”
Dodge 315/325 Hemi – 4.25″
Desoto 276/291 Hemi – 4.00″

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What would the b engine be out of. This engine was built and put in before I bought it. It is a molar 360 small block. I’ll measure the shaft length tonight. I bought it from a 3rd party online and they did not say whether it was LA, B, or anything. I did not realize there were different distributors for these small blocks.