I'd like to thank everyone for their replies. It looks to be a doable project, so I guess the next step is to find a car

. I did find some line drawings and measurements for the FE, 351W, and the OHC engines. The OHC is the widest of them all, but the carbureted engines are taller; might need a hood scoop. It looks like the biggest issue is the K frame. I'll need to check with the aftermarket manufacturers, but it doesn't look like there's a big difference in the motor mounts between the FE and the 429 blocks.
Anyone else with experience in a swap like this, please feel free to chip in. Thanks.