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I have looked at your prior posts. You have a 351W/E4OD per prior posts. You were talking 460 in your last posts and regearing in another.
Now you have a 429 in mind.
I note you are in CA. You will not be able to make a 429 smog easily. If it is an older high compression job, you will probably have to find a way to lower compression.
The same would apply with a 460. You would have to bring a compliant '91 or newer 460 will the EFI, computer, harness etc etc over to the Bronco.
Neither engine was ever OEM in a Bronco, so you will have to deal with a smog referee. Good luck with that.
Serving suggestion: Tune it up, fix your trans leak, regear if you must.