Got bored and did an inflation adjusted base model V8 price for each gen. Cheapest V8 numbers i could find. Might not be 100% accurate so don't crucify me if i'm off a bit.
1st Gen: (1965) $28,500
2nd gen: (1975) $21,200
3rd gen: (1987) $35,900
4th Gen: (1999) $43,075
5th Gen: (2009) $41,800
6th Gen: (2015) $ 45,744
7th gen: (2026) $ 46,500
But even doing this quick, you can see which way the numbers are headed for a base V8 car. Granted, you get way more bang for your buck these days but it's quickly pushing out of reach for some, especially when you consider the interest rates being offered today.
I threw together a build on a GT premium with 360 copilot assist and the performance pack and I was over $60K and i didn't even check off all the boxes I really wanted. When i graduated college back in 2003, I splurged and ordered myself a brand new 2003 GT, got all the options available and that was $27-28K which is $47K today. But that was fully loaded with the Mach 1000 and the brite wheel option and IUP. Now, That's what a base V8 starts at today.
At $60K for a new Mustang GT...well, lets just that's why I am in an Explorer ST. I needed practicality along with some fun. I can't load 20 bags of mulch into a new Mustang.