Best to cut the bulkhead and move the engine back Ben. Will improve the handling the further back you fit it

With the engine fitted where it is now have you got any room for intercooler/radiator ?

I can pop up and give you an unbiased view on it if you need it ?

EDTITED TO ADD: Just noticed that you've fitted the full floor that makes it more difficult. Would be very expensive to get custom arms built and i'm sure you will have wheel/inner arch probs by the anti roll bar floor mounts. Also steering arms will be at a bad angle.