Mybe you should Talk to Geof Ketchum or Bobb Makley they Have a shop called Finishline they have a Machine shop they build lots of Buicks Engines they are in MI. I do not have there Number on hand someone i am shure will post there Number for you.
You would be better off building a 464 and putting the extra money into good heads and light internals..my 0.2 mike
i plan on making this a long project. Im still gonna buy some new heads some stage 2 TE , TA recomened them for a stroker kit