In 87 I bought a 77 Impala 350 / turbo 200 with 100,000 miles (right at the time of miles / kilometres changeover in Canada) from a lady whose brother was a used car salesman that persuaded her to only use Mobil 1 from day one.
This four door brown with tan interior (still makes the hair on the back of my neck… anyway…) Impala was a means to an end, just an interim for reasons .. anyway,
At the time, I hadn’t driven anything with power for almost ten years nor did I care, it was cheap, big, safe for a horrible driver and a car seat.
The car was like a used taxi but the engine was like brand new, it had 100,000 miles on it which on any carburated engine shows, at least a bit.
It was a 4 barrel rochester but there werent a lot of cars making even 200 hp then.
Long story short, the achiles heel of course was the T200, I kept the car around and sold the engine the moment it started, I still remember the guy’s eyes lighting up.