replace stamped steel rockers with ductile iron rockers

I am going to change the intake and carb on the 340 in my duster. At the same time , i was going to install a factory set of 273 adjustable rockers. Can anyone give me some pointers? I am thinking that i will have to buy a set of hyd. pusrods for adjustable rockers, but i have the 273 pusrods that came with the adjustable rokers, but they may be to long due to the 273 being mechanical cam. I was also wondering how to adjust the rockers oncce i get them installed. I f anyone is running a set up like this would you please let me know the best way to pull this off?
Thanks in advance, Matt
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