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Welcome to the forum. Slant sixes are very common, probably the one of the most common engines ever built buy Ma Mopar, so finding one is not going to be an issue whatsoever. As far as a transmission goes, look towards the trucks, as they had slant sixes and three and four speed transmissions there. The bolt pattern, thus bellhousing, is specific for the slant six, starter location is different than for the V8 engines.