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Barely fits between the frame rails. Have to lose the heater box completely and power stearing/brakes. Major firewall and trans tunnel surgury is required. Major surgury to fit a radiator infront of the motor is also required. Then you have to upgrade the axels. the stock dana 28 front grenades with a V6 and 32" tires.
I'd save the 429 for something else and drop a 302 in it. They almost bolt in with Ford parts.
If you can fit a 460 in a Pinto, you can put a 429 in a BII. However, I have to side with Ken and Pat67Shorty on this one. Better off with a 302, and finding a T-bucket for the 429.