March performance vs cvf pulleys on 340

Yes, water pump pulleys have two different bolt patterns using two sets of holes, it's a standardized SAE deal on most of our stuff. The suggestion to measure back to a known position is excellent, too. A framing square is a handy tool here, too. Hang it over the pulleys and measure back to an available flat spot and record the readings. I would be inclined to do a rough in assembly with two bolts on the crank and water pump pulleys and assembling as the instructions dictate. Then measure everything the same way again and do the +/- math to see what has the most difference on alignment and what needs to go where. One problem that comes up the most often in my own experience is the water pump pulley not being deep enough to reach the rest of the pulleys having to shimmed or spaced out to meet the water pump groove. It's the real deal breaker about doing it any certain set way so before and after measurements are going to be your best friend.