Yes they bolt right up.
The same casting (113) was also used in the Corvette L98 from 87 to 92, but with different machining. Be sure which setup they are, as people aren't real rigorous about makign sure their description actuall matches the heads they have. The stock L98 ones were set up with much weenier valve train parts.
Most any 350 will make around 400 ft-lbs... maybe a bit more. Those heads aren't anything particularly unusual in that regard.
The "stock" ZZ4 cam was 208°/220°, .474"/.510", on a 112° LSA IIRC. The heads can stand QUITE A BIT more cam than that. For example alot of people took out that cam and put in the LT4 HOT cam, for a gain of around 20-25 HP. There's plenty of others that will work better than that.
With MILD porting they're good for a bit over 400 HP. They do not respond well to a BillyBob "hog em out" job.