Decent Slant 6 carb, intake, header setup

My brother, an old school Chrysler mechanic, suggested a 360 transplant, as well. If I go that way, I must do the stroker 408. If the slant can do 9-12 second quarter mile runs, Why is it that everyone insists on a V-8 transplant? Is it because the slanty is not a good all around street performance engine? Or, is it just the easier and more cost effective way to get something done?
No one is insisting anything. The slant is a labor of love and they look so cool under the hood. Just do what makes you happy. :)