What's the front axle rated for in the S10. I don't know much about the 6.2L's, but you might be seriously overloading the front suspension and braking capabilities of that truck, to the point where its dangerous. I don't know, but if the 6.2L is anything like a Cummins 5.9L from standpoint of weight, look out below.........
Interesting swap though. And I do know people that have gotten very very good mileage (mid 20's on the highway) with the 6.2L, but they generally don't make much grunt. My 5.9L will do low 20's on the highway no problem and on a long trip can pull 23-24 unloaded open road and still pull your house off its foundation.
Looking quick the fully dressed weight of a 6.2L is about 725lbs +/-, a fully dressed SBC (iron head/intake) tips the scales at 550-600lbs +/-. That's pretty big jump and doesn't include rad upgrades, hydro-boost for steering and brakes etc etc. The front end of that truck is going to be asked to shoulder pretty hefty load? Any kits out there to address this?
If you are gonna run stacks, this is how you run stacks.....
http://www.youtube.com/watch?v=RoOrSuJFG4c
How fast do you think the locals would pull you over for that behavior?
Caution you might have some redneck in ya if you watch this more than once:
http://www.youtube.com/watch?v=Krqt_w6NSJM