Jano is quite correct.
Proper design and testing is a must. Center inlet unmodified is your best bet for even air and fuel distribution. However, a side inlet may work if modified and tested properly. Not just guessing about design.
Take a look at this thread - inlet design for L6 Nissan:
http://forums.hybridz.org/index.php/...fd+%2Bmanifold
A few pics:
Better design: Money is obviously no object here
All I can say is WOW!!!