I believe I have the best reason for building a small block!

I built my 408 small block before the 440 stuff got cheap. There were no edelbrock heads and no 440source when I built it. Would of cost a fortune back then to build a 440. So now that I have a 408, I can't complain. It's a 10 second pump gas motor through the mufflers, power steering, brakes and it was my daily driver for several months.
Nowadays I think it would be better to build a big block for the price.