yo,
As Krafy advised, an in-line electric is prob best bet; depending on where that L block came from such as an E 150 series van, the engine mounts should be checked for fit and that is ez. to trim or replace.
Here is a pic by Lightnin of his 83 XLT, 351W, C6, NP205,
Rebuilt 351W, Edelbrock Performer Cam, altho it is not a 5.8 swap, but shows alt mounting, etc.
Electric Fuel pump, Shorty Mustang Headers. Saginaw P/S Pump, Soon to be OBA.
Drivetrain: C6, Rebuilt NP205,In the process of swaping in a Rebuilt Solid Front D44 Lincoln Locked with 4.10's and a Rebuilt D70 rear.
showing the alt
more pics in his SM file @
http://www.supermotors.net/registry/5435
Some 351 vs. 58 info Notes I have in my site;
351W; "...The 84-87 351 ** has 4 valve heads and a 4 bbl Holley carburator;
The standard 351 only had 2 valve heads.
Out of curiosity about the original question I checked the 1985 Ford Truck Engine manual and the 1985 Ford Truck sales specifications on the 351 W engines available in 1985. The only major differences between the 351W ** and the 351W are the carburerators and intake manifolds.
The ** has a 4V carb or 4 barrel carb.
The plain 351W has a 2V or 2 barrel carb.
Both versions 2 valves per cylinder. No 4 valve heads available stock,
The intake manifolds differed to accomodate the different carbs. There are some other minor differences dealing with the air cleaners and vacuum hose placement and routing and linkages. There doesn't appear to be any substantial differences in the engine internals..."
Source: by MW95F250 & rander101
5.8 94-97 F4TE blocks equipped with a roller cam used a 7.567" push rod
351W - non roller block, 8.150"
by sackman9975 (Scott)