Oil ports? What oil ports?
If it is to do with the means of geting oil to the rockers, then my oval port head is a direct bolt-on to an A10 or 1200, but you may have some trouble if you use a 1974 & later head, so it's not the shape of the ports that matters, it's the year model of the head.
In this regard at least, the A10 & 1200 blocks are the same & if an A10 is a bit hard to find, then a 1200 would serve the same purpose.

Drop me an e-mail if this is what you are trying to figure out, & I will bring you up to speed as best I can.