I have several buddies with late '80s 5.0s that have over 150K miles and they still run strong and smooth and don't even use that much extra oil.
I have owned 3 different 5.0 Stangs - an 84 LX that I bought with 80K miles, an 87 LX with 50K and NOS, and a 79 Pace Car with 160K and driven them a total of about 50K miles. The only time I ever broke down was when I blew a radiator hose, which isn't Ford's fault anyway of course.
If you are smart with a small block Ford and don't make any big mistakes under boost or while spraying, you will have a good running machine for a long time.
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2000GT Atlantic Blue: Cobra R Wheels-17x9 255/40/17, 17x10.5 315/35/17, tubular K-member & control arms, Tokico 5-ways, coil overs, sway bars, strut/shock tower bars, 70mm FMS throttle body, Saleen nose.
79 Pace Car: Maximum Motorsports suspension - H&R Race springs, Bilsteins, rear control arms, chassis bracing, Draglites, 302 w/ Edelbrock Performer intake, cam and 600cfm carb, BBK equal-lengths & H-pipe, 2.5" Flowmaster 2chmbr exhaust, Al Driveshaft, 8.8 trak-loc, TCI C4 w/ 2000 stall, B&M
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