What 65Vart said. Better off tracking down a intake to fit easy.
Otherwise, what he said again. Hog out the bolt hole to the new angle, spot face weld the rest shut or use a washer to cover the hole up.
The issue of oil coming up through the bolt hole is very possible. You can stop it with lots of telfon tape. Fill the hole with sealent. Then theres the bolts new angle, the head will not sit flush with the intake. Some brain said to me once, have wedges made so it sits right. Perhaps he never tried to have that done, perhaps he knew somebody and had it done easy.