[po_bird]

First of all you should take the block and crank to the machinist and have them looked over. The mains most likely can be line bored but the crank could be to far gone. If every thing checks out, follow through with your build. I would go with the vortec heads like 67ss said. They breath so much better. Plus they are pleantyful and most likely can be found at a decent salvage yard at a better price than having you 70 heads worked.