Listen to lluciano,he is right on the mark,your only advantage would be gas milage,and with your hp expectations,you will need a big cam,there goes that benifit right down the toilet." For low dollar streetable power,you want all the cubes you can get from factoy stuff. I used to argue the same way you do,and I did build some hot stuff,strait 6 motors that kept up with big blocks,302 chevs that turned 8000,but you know what,all I did was prove I could,bottom line is,they were very time consuming,expensive,high maintainance motors that could have been smoked for a lot less effort. Im just trying to tell you what others should have told me then." Im not saying a 327 is a bad motor,in fact I like em,just dont get your expectations of hp up if you want it to run right as a driver.