You'll need a V6 4L60e or a V6 Bell housing for a T5. The 3800 is not a standard SBC Bolt pattern. Another issue with a FWD motor in a RWD car is the TB is going to be pointing toward the firewall. Some careful measuring needs to be done. I know in an Fbody the TB would touch the firewall but in a truck you have considerable more room. What about pulling RWD 3800 Mounts and start fabricating from there?