Opinions please- new hemi or 408?

I proposed this question in my build thread but thought this section may be appropriate as well.
I bought a complete 2006 5.7 hemi out of a cop car for crazy good price. I wasn't even in the market for it but couldn't pass it up. Now do I reuse my built 408 or use the hemi? I plan to use the car as a reliable driver. I know the 408 will have more power and could be just as reliable.
I figured most guys on under this thread are pro hemi, but it would be nice to hear some opinions of the guys who have done it. I'm torn because I love the torque my 408 has, but the hemi is, well, it's a hemi. Opinions are greatly appreciated!