Well, Ive got time but I'm trying to get the lowdown on my options. So, I'm thinking of getting either the vortec replacement long block or the new 383 vortec truck engine. Both of these use the roller cam. Instead of getting the costly edelbrock mpi conversion, I'm cosidering the new GM tbi/vortec manifold, edelbrock's unit or getting an adaptor for any vortec manifold. Anyways, has anyone used their tbi on different or modified engines? If so, is there a practical way to recalibrate the ecm or can this thing "learn" on its own. Thanks.