Maby next time a good idea to convert it dry sump.
A good starting point will be us zetec or svt engine block.
But if it has to be a ford cosworh engine you don't have to much choice maby a zetec cosworth wrc block will be ok if you can find one.
Or true frankenstein engine will be cool like a mitsubishi 4g63 or nissan sr20det or a toyota 3s-gte but that will piss of some people.