if you have the money and know how here is what you want.
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33716&item=8024752031this is just for starters
If you can find them you should get aussie head, Australian made , they are the best out there for the cleveland.
http://cgi.ebay.com/ebaymotors/Aluminum-Aussie-2V-Ford-351-Cleveland-heads-351C-Clevor_W0QQitemZ8042818469QQcategoryZ33617QQssPageNameZWDVWQQrdZ1QQcmdZViewItemIf im correct you should be able to get aleast 500 hp wwith just this and should beable to still use pump gas ,well premium atleast with out pinging.Im thinking about going this way if I have to redo mine... I figure about 3 grand it would be a ARSE kicking motor.