360 or 340?

Short stroke/big bore is probably the best way to small block power.

If you consider it, the 340 was designed as a high performance engine while the 360 was basically a truck engine. If everything was built the same, a 360 will make more torque and will attain peak HP earlier in the usable rpm range while the 340 can rev to 7K plus if built right. A 340 may not make as much torque but will be pretty close.

I always vote for the 340 because of the short stroke and large bore. Think of the Chebby 327/302, Ferd 302/351, all legendary performance engines with a short stroke/large bore combination. Over square engines rule.