I've never thought of it as the "thrust side". If it's made as those 340 rods shown are you'd match them side to side as long as the oil squirt holes line up to lube the cam and cylinders. There's really no thrust side except on the mains...
But if the rods are all machined evenly side to side you'd simply install them as usual and measure your side clearances and you're done.
Those Pankl rods are the same side to side but they are machined so one side goes towards the crankshaft radius.
Racetec will be making the pistons to hang on these rods... Since the original application was a Chevy RO7, and my SBM 383 journals are wider than the width of the big ends when installed, I'll make some washers to fit on to the piston pins so the rod will be centered on the piston... Pretty common deal when mixing and matching used and new parts from who knows how many original applications...
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