I checked the site and in the description it said the heads will have screw in studs with guides. Yes they will just bolt in the place of your original heads but it looks like you will have to invest in adjustable rockers.
I have the 351 "Aussie" heads. They are an awesome head, I got them with every option but the wire loc because it was not offered at the time. The flow numbers are excellent. One thing to look at too is the compression of your motor, these heads have 62CC chambers, I went up from 9.5 to 11, when I switched of my 2bbl heads. They do have screw in studs and guideplates, so you need hardened pushrods and adjustable type rockers.
Thanks again for the information. I am Currently working on an "upgrade Package" for my tool. This package will include heads, Cam and Headers. I may have to ask the Board here for there expert advice to get this package designed.