Engine decking issue(help)

So i just got home from work, when i get up i am going to go talk to him and bring my assembly parts to see if im able to do quick mock up there just to see where im at. As for the surface krazykuda i was unsure of the eddy heads on cast 340 block, just wanted to eliminate anyway for leaking. I am also going head studs also. I will update with what i find and i dont have a 12inch caliper but i will see if i can use my machinists caliper as all i have are a 6 inch. I really appreciate everyones input and thank you guys