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Further, no 58 Fords had 312s. Only some Mercs. If the engine is a Merc, if not repainted it will likely be a blue green color. As stated, for a 312, check for a 5/16" diameter shallow dot on the crank flange & or ECZ on the main caps. Then with your fingers crossed, check the main areas for possible cracks, before spending money on it...
Paul
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To the best of my knowledge ECZ blocks can be either 292s or 312s, best to check the crank for the dot. I also found that EDB-E can be a Merc 312 but again when in doubt check the crank or the main caps.
 God Bless.  Tim http://yblockguy.com/
350ci Y-Block FED "Elwood", 301ci Y-Block Unibody LSR "Jake", 312ci Y-Block '58 F-100, 338ci Y-Block powered Model A Tudor
tim@yblockguy.com Visalia, California Just west of the Sequoias
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EDB would be correct for a '58 292. Although ECZ on the block or crank would indicate a 312, ECZ heads where used on 272s and 292s as well as 312s. Before some one corrects me, ECZ casting on the block does not always mean a 312, it must also have ECZ caps. 
God Bless. Tim http://yblockguy.com/ 350ci Y-Block FED "Elwood", 301ci Y-Block Unibody LSR "Jake", 312ci Y-Block '58 F-100, 338ci Y-Block powered Model A Tudor
tim@yblockguy.com Visalia, California Just west of the Sequoias
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312 engine 1957 vintage found in passenger cars and TBird(supercharged) 300 HP 1.925 intake valves and 1.510 exhaust. You have a winner!
 55Birdman Hickory NC
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Hey I have a Y-Block that I pulled out of a '58 Fairlane, I was told it was a 292 but upon further inspection I think it maybe a 312. The block casting # is EDB 6015 E, and the heads a ECZ-G. any info would be helpful... Thanks John
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