Put some good pipe sealer on the studs. Put em in and I'd let em set up for a day just so everything is in dried and tight. Then put the exhaust back on. I'd drop the downfall pipe on the driver's side and just pull the exhaust off far enough to get the studs out clean and coat. If it were me, if the driver's side hasn't leaked, I'd forget it and just do what is leaking. Keep a check on it but if it's going to leak, it will leak at the beginning when the stuff hasn't gone through and heat cycles. To be honest, I'd work on small block stuff anytime compared to some of the big block stuff. Of course everyone talks about Cheby and Ord stuff, I've fooled with both, Mopar is still to me easier all the way around. I can get the '71 Duster to run better at the drag strip than the other guys can with some gear and torque converter changes. Allen