Back in 1996 when everyone was using a VW engine in their tube frame sand rails, I decided to build and install a 2.2 liter Subaru engine. Sand SPorts Magazine did a 4 page spread because it was a novelty. I ported and polished the heads, installed oversize exhaust valves, had the cams reground to add overlap, installed JE pistons and 50 lb injectors using my home made fuel rails. I added a Turbo from a GMC Syclone and on the dyno it produced about 375 HP... "Cant remember the torque" About 10 years ago, I broke the engine case when my frame busted. At that time I installed a 2.5 with STI rods, JE pistons and kept the same single cam heads. On the dyno it produced just a bit more than the 2.2 but torque improved substantially. The biggest single expense was the ECU and I can't remember which unit I used back then. Since that time, I have changed ECU's and I'm now using a Red Line ECU. Power is still the same on pump gas and after 10+ years on this engine, it still runs STRONG and the only maintenance has been changing the fuel filter, the cam belt and of course oil and filter changes.
It doesn't take much money to get a strong and reliable Subaru engine and of course if it's not turbo charged the cost is much less. My friend has a 2.5 with double overhead cams, a turbo and racing fuel and he's producing almost 500 HP.
In addition, 10 miles in the sand is probably equal to 200 miles on the road and I go to the dunes 4 to 5 times a year and I'm there for 10 days at a time. When I'm there, we usually drive 50 to 60 miles per day. That should show you the reliability factor that these little engines can deliver.
Another friend has a slightly modified 2.5 Subaru engine that he purchased for $600.00. He ported and polished the heads, added forged pistons and a T3 turbo. His car will go anywhere my car will go and has tons of power. All summed up, he has about $4,000 in his engine. By the way, he beats up that engine the same as we do and it's still running hard and strong.
In conclusion. A stone stock Subaru engine will propel your car WAY faster than your reflexes can compensate for the car going squirley. They are an amazing little engine.