Re: XF engine rebuild
If your doing the work yourself you will be okay but if not i dont see you getting much done for $1200
RPM engines sell stock reco's for 1900 and mild ones for 2200 not fitted.
The EFI system apparently doesnt handle extensive mods either. You will need an aftermarket computer to deal with the changes.
If your doing the work yourself you can buy an ACL race series rebuild kit for around $600, you get flat top pistons and I think a better cam with it.
Twin Cam EA falcon
SWB Ford Maverick