Different 318 casting.

MOPAROFFICIAL said
You're set then, get it bored & honed then grab some kb243 pistons...and if you are the careful spender get a sonic test before hand.

take all the pictures of the visual differences between that block and the other you have of different casting.

You`r right there , Sonic tester , its a djungle to find a reasonable price on one that works for cylinderwalls .Any useful ideas??