A 302 will fit, but a Small Block Chev will be slightly more compact and is better supported by availalbe adapters.
Bellhousings adapters for either the 302 Ford or the SB Chev frequently appear on US E-bay, while several manufacturers such as Hurst and Wilcap make front support brackets that drop the SB Chev straight onto the original Ford front mounts, thus not requiring any irreversible changes to your carrier. The 302 will take some fabbing of eng mounts.
The original Carrier/CMP gearbox and Diff will easily stand up to the power and torque of a stock 302 or Chev.
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