The rad will mount further forward in the chassis rails using the holes normally used by a 500 cooler, you will probably need a custom cooler then to fit the smaller opening -that will give you about another 40mm, and using slimline fans will give another 20-30mm. The space is there but any more and your then talking custom v shaped coolers and rads, base type headlights rather than the wider cosworth ones. Trimming the lip of the bulkhead at the back of the engine will give another 20mm or so

Your would be putting more weight ahead of the axles as well, most people relocate the bulkhead instead like Brom etc

Its 80mm from the front of the thermo hose to the back of the rad but this narrows down to about 40mm due to the 2wd intercooler and fans