My son is using those lifters in my street motor. The trick is bush and tru the lifter bores That is why he bought the tooling.
I talked to him about your block . That was done to your block years back when they splash oiled the lifters. Not for street. He also said the other side would need to be done for splash oiling.
He said he would ream the tube out if it was here. Many people have problems with these lifter due to the bore being to big and having them bleed through. Use the lifters but prep the block properly.