I too have a R1 block but have Indy heads and have considered boosting it (turbo). My concern is how much boost will the head gaskets handle with the four bolt design? My block and heads had the extra bosses for the extra row of head bolts on top and bottom. But I had to remove the bosses in the lifter galley to allow the roller lifters to go in. The bottom row is still there.
depends on how much boost you want to run. will it hold 30 PSI? id guess not. Will it hold 10-14 im sure it will with good arp studs, and a quality head gasket.
on one of my imports at 25 psi it lifted the head a little. So now I have to O-ring the head to run 30 PSI. I dont see why that wouldnt be an option for a mopar. they do it all the time on diesels.
