I had to install a 305 while the 454 gets rebuilt. Been trying to rebuild it for 7 months now! Difficult to do in Korea! Anyway, the 305 needs oil and water sending units. Where exactly would the water temp sending unit screw into on the block as well as the oil pressure sending unit? Been running without either thinking the 454 would be installed already. So I don't have any to remove and replace which would have been a simple R/R job. Thanks!