HELP!!!273 rocker shaft and rocker install

Got the shafts on right, one more question for those that have used the isky cam, will any grinding need to be done on the stock rocker arms? or is just kind of hit and miss? I am on hold for the time being as I need to get a thread chaser for the rocker shaft bolts. On a positive note I did find the fiber washer for my oil filter adapter, it had fallen out of the gasket set box.
Thanks
Aaron
Now a couple of potentially stupid questions, are there specific rockers for the intake and exhaust or are they all the same(I kind of got them mixed up in disassembly), and all the pushrods should be the same length, correct?

Trying to wrap my head around this. If the pushrod cup is hitting the rocker arm now, it will still hit when the shaft is torqued down, won't it?
Read memikes 273 build thread, and it got me to thinking maybe the rocker arm is hitting the spring/retainer, never thought to check that, and it's supper time/mythbuster time, so will check that tomorrow. My brother told me to use the rockers off of his 340(converted to solid cam), they appear to be clearanced already, but I am kind of stuck on using as many of the parts that my Dart was born with. His rockers are cast iron stockers, so they would have to be 273 correct?