It will bolt in, will it cool enough you would have to run it to know. I ran the 409 with stock 283 rad in the 59 and I think I used the original 283 fan shroud, no problem but I wasn’t running it a whole lot in temps above 80f or in hot stop and go traffic. I don’t live in AZ.
My theory is that some W’s run hotter than others, some will work fine with a stock rad, some will need all the help they can get. I’d try it as is, add W fan shroud if it runs hot, then change rad if needed. It’s easy to change out the rad and fan shroud so no need to rush into it IMHO.
I bought a “409” rad and have an original W fan shroud in my 63, I also run the idiot light and a mechanical temp gauge.