Fuzznag rally have the perfect donor car for a rally 400 replica. It's already got the 400 bonnet, 3 piece rear wing, fibreglass doors, red top on 48 dellortos, LSD, straight cut box, cage, rally intercom, heated screen etc. The bodywork needs stripping back to bare metal but that's why it's ideal as a donor car because you will be replacing things like the wings and bumpers anyway. Also it's a non-sunroof coupe so no worries about rot in the roof! Speak to Gavin and tell him that Alan Forster recommended contacting him. It really is ideal especially if you want the full-on rally experience. Worth considering anyway.
Regards
Aln