opinions on stroker kit?

http://www.edelbrock.com/automotive_new/mc/cylheads/chrysler/sb_perf_rpm1.shtml
Educate me, i dont see edlebrock listing a open chamber. They do list two different heads ,but the only difference i see is the cc's. I have the 60775 for hyd. Flat tappet.

Do i hve the right heads for my 340?
Here is both in the compare section of summit.
http://www.summitracing.com/compare.aspx