Converting a 3 speed manual to 4

JGC403 said

So the 3 speed bell can be drilled to accept the 4 speed or were some Bells made to accept either?

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Some were made to accept either. If you get under the car and look at it it will have other holes drilled and tapped if will accept a 4 speed if you see no other holes other than the ones being used by the three speed you will need another bell.