The lightning engine was no more than a ford sportsman engine block with some alum GT40 heads and eventually a supercharger...

the stock EFI setup will work with the GT40 heads....This is what I am running(GT40X heads)......minus the sportsman block....

I am running the siamesed R302 4 bolt main engine block on the 69 mustang and all the windsor heads etc....bolt right on as well....

I love the interchangability.....