Slick 60's

I have A 66 slick with A 390, c6 set up. The gas mi is below 10 short trips hyway maybe 13. Can't aford to drive it much with the price of gas now. I have A crown vic 89 model doner that I can change out the drive trainto the slick. It's A 5.0 efi withAOD.I know it would make a big diff. but how much .I'm sure a lot of you have done this swap . what kind mi can I expect with this swap also what about the preformace.The ol 390 is a strong runner . Kinda hate to give her up.

First Where in Al are you?I ran a carbed 302 with mid 80s aod and 3.89 rear gears in my uni for 6-8 months. Got 20+ mpg. FI should get better than that.

im in the middle of hookin mine up (63 flareside gettin a 302 with 2 barrel and aod) when you doit it will be worth it just on the saveings in time fillin up not to mention the cost of fillin up

Hey Mike ,I'M in Muscleshoals. I,ve been a member for a long time.Came over from the old blue oval club .I just haven't been on line in awhile.Do you remember the 64short bed you got up here a few years ago?I'm still at the same place.Ihad to reup when slik 60's changed web address.Ihave A 5.0 ho set up in my 36 convert.but i'm running a c4trans with3.0 gears.The best I've done so far is 26 mpg hiway.I'ts a lot lighter and more aero. than the 66.Also I'm useing the stock 89ho EFI.thanks for the info.

I have a 66 custom cab with a 390 and 3:13 gears in the rearend and the original tranny and I get 19-20 mpg on the open road. about a month ago I hauled a flat bed trailer with quater midget race cars on it from Bend,Or to Portland,Or on a half tank.