let's see....
#1 camshaft on the original 3.8 broke at the cam gear...
#2 with the new motor(350 olds...don't kill me, it was free) broke the torque converter bolts...
#3 350 olds let go...apparently the oil pump will not pump oil sufficently at over 6000 rpm
#4 2nd 231 NA motor...fried trans due to the cooler lines(rubber hose) melting on the exhaust.
#5 swapped to an sbc....fragged the stock 7.5 posi..
#6 new posi, destroyed the trans due to an error in the shift kit install..acted like a 5000 rpm stall...
#7 split the casing on new trans when the rear mount tore in two...
#8 wiped 4 lobes off the sbc camshaft(they don't like 8500 rpms) barely ran....
#9 broke valve springs on 5 cyl....should have replaced those with the cam....
#10 fragged the 7.5 due to the pinion nut coming loose after i had the pinion seal replaced....now the reason why only i work on the car...
#11 broke a valve at 5000 rpms....carnage included the cyl head, cracked block, twisted rod, and a piston that came out in 9 chunks...
#12 fuel pump for the new 5.3/t56 setup quit after 50 miles and 2 dyno pulls
#13-19 ecm decided to revert to factory programming and reinsert the VATS portion intermittently...6 times total
#20 desplined a 28 spline ford 9" axle and fried the stock posi unit powershifting second..
that's just counting the ones i trailered it or had it towed...the roadside repairs are too numerous...the sbc would throw belts any time i over revved the engine(which was at least once a month) and the mechanical fuel pump went out once....i used to keep modules/coils for the HEI in the trunk with just enough tools to install them.
hopefully the 5.3/t-56 and 31 spline mosers will hold up this time