Faster for cheaper? yes but if you put your money into the FI and not the engine, it will only be fast for a short time then it will be broken. Ive ran em both, if you want a FAST FI car and im not talking mear 12's, you have to dump the NA build money into the engine THEN dump the money into the FI system.
There arent many GM motors that can retain stock internals and handle the pressure of FI.