That is a "peanut-head" engine. They don't have the spark-plug tubes, like earlier engines. The biggest disadvantage is that to replace the valve lifters, you must remove the head, so no easy camshaft swaps. I think a 1980 would also have hydraulic lifters. Advantage is no need for regular valve adjustments. Downside is less performance and no option for a wilder camshaft. The later 998/999 transmissions are a bit better I think, but read-up that there are no connection issues (lock-up torque converter electical input, etc). A truck tranny may also have gear ratios that aren't as nice for a car.
