sorry but what you are saying is not completely right
-the cylinder head i saw it my self the one from the 505 with 4 inlets
-well over 60% of the spare parts is still made new and most of them in france
-you know in other countries (australia) they still use this cars every day that means that there is an awful lot of spare parts to come
-as for stability i have to disagree because i have wider tyres lowered suspensions and front strut bar and believe me it is very stable
-top speed of a 504 with 4 speed gear is 170-180 what do you want more from a 30 year old car
-and lastly if you took good care of the car you wont need that much of spare parts only periodic maintenance
i wanted to ask you a question was your steering rack 3.5 turns
if so can i install it without the power steering
thanks