Ok the basics first! the twin cam type crank pulleys on the left, late sohc on the right:
These crank girdles are the only real benefit of using a narrowblock over a starion block, but they can be used if you line bore the starion block to suit them:
There are two different starion cranks, a long nose and short nose, the digital verniers tell the story. the long nose is the one you want for a twin cam pulley setup. the stock twin cams are long nose.
Here are the stock rods from a starion, dohc n/a and a VR4 motor. as you can see, they're identical, and safe for about 7000rpm. they dont compress under power loading either (within reason) but its so cheap for aftermarket rods these days why not use them?
If you retain the balance shafts, use the starion upper shaft with the starion block, as the dohc shaft hasnt got provision for oiling the rear bearing. also use the dohc oil pump housing complete with the dohc shaft etc. starion one is the top one.
Here is the stock dohc motor from a front view. note the pulley/tensioner arrangement. the stock auto tensioner is best converted into a manual adjustable type, APC do this cheaper than i could get it done. but yes just use all the dohc pulleys/brackets/alternator p/s pump etc.