Duster Help
If the person who told you that's an 8 3/4" is the same person that told you that's a 360, it probably isn't. It will say what engine it is on the side of the block. (Forgot which side.)
If it has an OEM balancer/damper, a 360 should have a counterweighted ring sticking out of the front around the crank pulley, or a section cut out of the outer ring. Although, there is a "small" chance that it could be an internally balanced 360 and uses a neutral/flat faced balancer/damper.
If the person who told you that's an 8 3/4" is the same person that told you that's a 360, it probably isn't. It will say what engine it is on the side of the block. (Forgot which side.)
If it has an OEM balancer/damper, a 360 should have a counterweighted ring sticking out of the front around the crank pulley, or a section cut out of the outer ring. Although, there is a "small" chance that it could be an internally balanced 360 and uses a neutral/flat faced balancer/damper.