Summer 1965, I got a 1957 Tudor post Bel Air with a sick 283 and Powerglide. I put in a 327 and three speed stick. Nothing at all hard. Putting a 401 nailhead with a top loader into a Model A was a higher level job a couple years later as I boxed the frame, changed to an open driveline, and made my own headers. Each one is a new experience.