Scored A Set Of Magnum R/T's!!!!!

100 bucks a piece!!! With a fresh valve job, bead blasted & clean,all wrapped in plastic. 2.02 intakes and 60cc chambers. Guy said they are off a 408 stroker motor he bought about 7-8 years ago. Ran the R/T's for about 10,000 miles and put Indy heads on it. Any issues with these heads I need to be aware of? I plan to put these on the 0 deck 318 I am in the process of building. KB167's +.040. Will I have to clearance the push rod holes for a flat tappet cam on these? I want to run a mechanical cam in this thing too, so I'm thinking the Hughes SS rockers would be nice. Any thoughts? Thanks guys!!