14010207 = 350 ,80-85,155-255hp,car & truck,2 & 4-Bolt, Passenger stick
3970010 =302/350 ,69-79,145-370hp,car & truck,2 & 4-Bolt, Most common
If your not going nuts on a high end build ,it's a toss up.
Both will likely need pistons and good heads along with a decent cam to bring them up to speed (no pun).
Pick one.
I'd probably lean toward the 010 but I'm old school.