Anybody out there swapped the 330 horse factory crate motor and used the stock TBI unit and computer (with modifications)??????Will it work? Do you have to change the cam? It seems like a great deal and I can't put a comparable rebuilt package together for the money (and it is all new factory parts). I have seen it as low as $2100. I know I will have to buy a new manifold for the Vortec heads but what other challenges await?