I would use the heads that came off your four hundred but to get any kind of decent power you will need to port them using Mopar Perfomance porting templates. This and the new springs already mention will go along way to producing a good engine you will enjoy.
Christian
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68 'Cuda 383 Working on adding EFI
69 'Cuda Race Parts Car
76 Duster 273 recent transplant
95 Neon 2.0 SOHC best of 16.96
84 Dodge Ram D50 transplanting 360
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