AMC 401 engine for my 1972 Duster

AMC 401 engine for my 1972 Duster
I don't know if this a good swap I owned a 1972 duster with a slant six engine a buddy of mine has a fully built amc 401 400+ hp that never got to use he's selling to me for $1500 with a 400 auto trans its has tons of new Parts headers, competition cams, Milodon oil pan, csr electric water pump and the list goes on....im tired of my slow slant six I mean good engine but too slow so I'm asking for opinions on this swap not sure in amc amc is considered a mopar

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I don't consider AMC's a Mopar either. Rambler bought Jeep and then changed their name to American Motors. They were failing and sold Jeep to Chrysler Corp. and then dissolved AMC/Rambler.