340 J heads?

I saw a pair of 3148915-H heads for sale and thinking about getting them for my 390 stroker.
Supposedly they have 2.02 intake valve's.
Will these be a good improvement over my stock open chambered 318 heads?
I'm just concerned about low end torque and rpms under 5500.

They will be a big improvement, but if they need a complete rebuild it will be smarter to go with the edelbrock close chamber

They have about 1000 miles since they were rebuilt so they probably just need a clean up. I can probably get them for about 300. Would that be worth it?

In that case i would go for it. if they have 2.02's and better valves and good valve springs you could use than thats a big bonus.