I spoke to GT ford performance today and got some prices on the Funnel web manifolds. They do a 4V Cleveland manifold for $670 Aus (about $380US) This has raised floor runners and requires port plates for the heads to make it realy work well. 2V Cleveland version was about $660. No port plates required for this one. They also do a 289/302 Windsor manifold for about $640.
These are retail prices quoted to me so there may be some room to move when talking to the right speed shop.
One interesting development they have is a Clevor manifold. This one is set up to suit 4V Cleveland heads on a 351 Windsor bottom end. Sort of a Super BOSS motor.
Here are some details on the Funnelweb manifolds.
http://www.fomoco.com.au/Funnelweb.htm
Here is a recipie for a tough combination. Combine the Clevor manifold with a ported set of these alloy Cleveland heads on a 392 Windsor Stroker bottom end.
http://www.pavtek.com.au/pp_3vheads.html
Cheers