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Well First of all is Buick grand national not Pontiac. and you would have a hell of a time to get a mopar engine to go a buick. especially a big block you would have to make several modifications i know for a fact the heater box will be in the way you would have to remove the heater box so you wont have a heater. even a small block would be ALOT of work you would have to modify you moter mounts and tranny cross member and fire wall and possibly floor pans. its not worth it.

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15y ago

What else can I help you with?