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yes it could fit
With enough money anything is possible. It would take building a frame and making the Dart rear wheel drive to fit the V10.
No.
No.
NO....
no way.
Any smallblock Chevy engine will physically "fit" into a 85 Impala
will a 3.8l engine from a Pontiac grand prix fit in chevrolet impala
426 hemi will fit or any new engine dodge makes will also fit.
Not without expensive modification
Purolator L22500
No