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McLeod bellhousing have a higher rate of being correct as they are hydroformed. The issue of dialing in the bellhousing is to make sure the input shaft of the transmission is perfectly straight (.006) when the transmission is attached to the bellhousing. If the input is cocked when the tranny is attached you will side load the input bearing causing potential early failure which could take the rest of the transmission out, especially the cluster, if the input bearing fails.
Typically, you can normally tell if a transmission hasn't been dialed in if, when shifting into reverse, reverse gear grinds going into gear. The pilot on the input is not free wheeling as it should, because if it were straight , it wouldn't be driven by the flywheel at idle. The reason you can't tell this by shifiting into the four forward gears is that reverse is the only non synchronized gear in the transmission.
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