Spoony, I have one of the RDI Ford blocks. Run the other way as fast as you can. The quality of the casting is sh**. Be prepared to spend considerably more time and money on prep work. Flashing everywhere.
Oil galley/water passage seepage. Many have to be sleeved in this area to prevent
oil in the water or vs. versa. RDI says it is a race component and no warranty exist. I countered that this an initial quality check that they as exclusive suppliers of the al bb should do. Complete engine removal and teardown required. One of the management staff at RDI agree to cover all cost, and was given the estimate by the intaller. 4 weeks later when the bill was submitted, they had fogotten. And sent a check for about 18% of the estimate. I have a very hard time dealing with people who produce a crappy product at a premium price and then don't support it. If you go forward, I would make sure the engine builder has knowledge of what he is getting into and will stand behind his work as well as the other components.
Richard
Memphis