360 Head Question

Like I stated in my other posts I'm new to Mopar,but not in building cars. I'm building a 1973 Dart swinger as a mild street cruiser.I'm in the process of putting a 360 in the place of the /6 and have a question about the heads that were on the 1986 360 I'm using. The heads that were on it are casting number 4027596. I have searched on the forum and have read some good and bad things about them. I just want to know if they will be any good for a mild street set up? The only thing that makes me wonder are the holes under the exhaust ports. These were covered by the exhaust manifolds, but I don't know if they will be covered my the headers flanges. I will appreciate any help.