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I have a 82 F-350 with a 400m and 4-speed. It's about dead and I am going to build a 460 to drop in. However, with what I have planned for the 460, it is going to take some time and money (which I don't have yet). I was digging around the other day, and have aquired a strong running 390 from a 76 F-250. The engine is complete from end to end. All accessories and brackets are there. It originally was backed by a 4-speed, so I also have the bellhousing for the 435. I am pretty sure I can bolt the block in the truck, but I am wondering what problems I am going to encounter. I also need to find a set of headers for the 390 that can clear the x-member on the 80-96 trucks. any insight on this swap will be helpful. Thanks
 

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Id say look for some over the fame headers the'd probably clear. What is the frame width on your 82?
 

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You will have to custom make your engine mounts since the last year for the 390 was '76. The 390 is a great engine but very heavy for the cubes. As far as headers they will have to be custom made or you will have to modify the cross member. As long as you make the mounts with the tranny bolted in place the clutch linkage should be OK. You may also want to see if the radiator hoses are on the same side. Also check the fit of the bellhousing in the tunnel, you may have to modify the tunnel since the top of the bellhousing is round instead of flat.
 

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they make headers for the 460 conversion, but i've never seen them for the 390. Thats a strong motor, but VERY heavy. I use and old intake manifold from a 390 as my boat anchor, no kidding! You'll probably have to modify the towers to mount the engine, unfortunatly you'll have to mod back to put the 460 in. If i were you i'd wait till that one is done. I have a 400M, albeit its a gutless whore, i've done as much to it as i was willing and get decent power out of it. Good luck
 

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Why don't you skip the 390 and get a 460 from a junkyard. That way when you build the 460 you want it will bolt right in and you won't have to redo stuff. Plus the 460 swap is common and well documented.
 
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