well guys its been a loooonnnnnggggg road. with tons of research many many people that i've talked to, i settle with this..... Mike Fredrick at Beaumont Engines in Beaumont,TX. did all the machine work, assemble short blocks, reworked the heads and installed on the short block, in short built long blocks after we discussed many issues out... Bob Lloyd at Full Throttle Marine did the ECM reprogram and dyno pulls.... started as twin (300hp @5000 / don't know torque) 350mpi injection engines ...... Finished with twin (400hp @5600 / 430tq @ 4200) 383mpi injection engines .... took almost a year ....... will post a few pictures shortly