Radiator selection help.

I have a 1964 Barracuda that I'm putting a 360 into.
The stock radiator is the 19" core.
Right now with the 360 in place and using the alum. water pump housing, I have 2.25" from fan to radiator mount. I'm am using the stock fan and spacer (which I think is 2").
I need help on finding a radiator that will cool about 400bhp and also fit in the stock opening. Is this possible?
Can I shorten the fan spacer if needed?
Any help and thoughts on this would be appreciated.
I don't mind going aluminum.
Thanks
Mark