Welcome to AF!
You can change this over to a 442, you'll need a bunch of parts though.
The front end, the bumper(S), the hood would all need to be found from a 442 donor car, and or you might be able to buy these new from one of these after market places like Year one.
They will be expensive parts, new or used.
Some other things like interior parts and all those "442" badges that go on the fenders. The springs and sways are heavier on the 442's. And I'm sure thiers some stuff I'm leaving out(like the 455 or the 350 rocket motor), but it is doable
If I were you, I'd do the restore the right way, that being everything from the ground up. You then would hav a practicly new ride that will last for generations to come.