"Buick 455 engines had better heads than Olds 455"
Yeah, but either one is gonna breathe better than a nailhead! On the other hand if the main priority is just tons 'o torque with which to slosh a Dynaflow around then the nailhead is probably more than adequate.
Those old Saab fours are really quite stout, my '87 900T was still running great at 160K + and using no oil. Unfortunately at around the same time the a/c quit, headliner fell, clutch or gearbox began to make some very strange noises, and then it was rear-ended. The hit was minor but did kink the fenders slightly and made the hatch hard to open and combined with the other issues I decided agaist repairing it. From what I can tell, gearbox problems are what usually kill old Saabs. The Borg-Warner automatics used in the 900 are typical B-W junk, and although the ZF in the 9000 is somewhat better it can be fiendishly expensive to fix if it ever goes bad. Manuals are stronger, but even those are a little weak in 900s. Overall though they are good cars.