NONE AT ALL!!!!! Work on older orphan cars and understand how nice a 'bad' part is.....at least a starting point.
My 66 Mustang is insured (valued ny my insurance company) about 4 times what my 73 Javelin is. But driving the Javelin is more scary.......EVERY part I need to fix the Mustang is made, and of good quality. A minor issue with the Javelin means a long term search and lots more work. It's all relative.