[Jrainman]

Ok My friend I have been driving my 68 everyday next month will be 2 years and I drive double that about 170 miles a day, 5 days a week , the first year I put 52k on the engine it came with. unknown 1980s 4 bolt main engine, and the only falure I had was my alt regulator,The 68had the external type regulator , I put a 308 rear in it to help keep the rpms down,if I kept my foot out of it I can get 16-17 mpg,but when you travel on interstates every Dodge Hemi truck wants to race you . a little after one year I pulled the tired unknown 350 out that never let me down and kept those hemi rams in the rearview , and I bought GM L31 crate engine bolted a fitech efi and mated that to a 200 4r and 47,000 miles later she runs like the day I installed it but never was able to get over 15 mpg but then again instead of 65 75 MPH i travel at 75-85 with that 2004r in full lock up on the interstates. Good luck and have fun