The tall deck block is 0.400" taller measured from the centerline of the main bearing bore to the surface of the block deck. Use rods that are 6.535" instead of 6.135", then just use the proper piston for the crank, 427 or 454.

Several companies make spacer plates that sandwich between the heads and the intake manifold, allowing you to run a standard big block manifold. Use any big block Chevy head.