engine build for reliability

5.2 or 5.6 magnum
new timing chain
shift kit
spare crank angle sensor, coil might even mount the spare coil with some quick disconnects and show daughter how to swap- seems to be biggest failure point
second in line fuel pump fuel pressure gauge
should run just about forever 0W-40 eurospec Oil for those cold starts AGM battery

I had a new 68 318 that went 300k but would not want daughter to screw with carb car these days in Michigan
new 92 5.2 truck now over 250 k only call to AAA was crank angle sensor and coil died but not all at once
my daughter drove 77 Pacer wagon- also no failures but she was hard on reverse until I went 999 trans with double wrap band
(steep backing up driveway late to school when cold)