The 400 Olds is a different family then the 403. Everything will most likely be different and it will be a difficult swap. I loved my 403 so I would never try to talk anyone out of one but Im not sure why you think it would be difficult or you would need a parts car to swap in a Pontiac motor. The 400(Pontiac) will drop right in with no other mods. All you would need is the complete motor.
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1971 Firebird Espirit
1973 Firebird Formula
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