Hello everyone, it's been forever since I've been here. My project has been on a seven year hiatus, but I am finally ready to start on it again. I'm planning to swap an LS1/4T60E into my '81 Malibu. Once complete, it will be my daily driver. I want to keep a/c and I'd like to see 25 mpg highway. I've looked through a few of the threads on here and on ls1tech.com. I can't seem to find a definitive answer to oil pan, engine mount or a/c issues. I'm assuming I'll need a custom driveshaft, any suggestions? If I do any engine upgrades, they would be pretty mild, possibly headers, intake or underdrive pulleys. I'm just looking to build something reliable, 350 hp is plenty for me. Any advice or info would be greatly appreciated.