A long motor doesn't include a gearbox. Long engines are basically rocker cover to sump with no manifolds, oil coolers or any ancilliarys. This is a Mitsubishi 6D14 truck long motor off my floorstock.
Before you replace the whole engine, assess what is needed first. Heads are readily available and the bottom end may be fine if not for a bearing replacement. Early 300's had a problem with the composite head gasket and a modification was made. The late head will fit both early and late versions and uses a steel laminate gasket and is also a huge improvement over the early ones.
PM me if you need further details.
Andrew.


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