I have had men from the days gone by tell me that they have bought a replacement engine (from a salvage yard) for 25 dollars and the shop helped them install it for free. It would take 2 to 3 hours and they were totally done..
My grandfather worked at the Ford Assembly Plant in Charlotte putting the canvas on the tops of Model T's & Model A's. After that he opened his own garage, retired in 1955. His old ledger I saw listed repairs, the likes of rebuilding engine $12.50 and such. I've heard him speak of making $5 a week ........ how times have changed.