A while ago I posted tthe number off of the side of my supposed 1974 390 block. It was DT4E-1 I think. That concluded that it was an converted FT block. I found another number on the front of the block on the drivers side. It was a backwards 105. It is in the same place where you would find the numbers 352 stamped on a 352. Does anybody know what my exact engine is or any specs for that matter?

 

that's just another sign of a D4TE block, they generally have thicker cylinder walls and I believe that was the casting that was used to make the 428 service replacement blocks, so frequently (compared to other blocks) you can take the bore to 428 size