For those who are interested, my project is still in motion (although going slow due to my crazy work travels). I decided to take what I've already done myself (custom front crossmember, steering rack mounts, etc) to a hotrod shop a few hours from my house to have the motor mounts and other minor fab work completed. I'm pleased to say that as of yesterday, the LS1 and T56 are in the car.....with no cutting of the firewall! Had to use a custom bellhousing as well as a manual rack to work. A custom one-off oilpan is being built now, as all oil pans on the market hang too low.
Oil pan, wiring harness, driveshaft, headers, etc are next. I wonder when this car will be finished. haha