I don't see any problem running a 100 shot on a stock motor if properly setup. You probably want to make sure that your fuel pump will support the extra 100hp or so. It's also adviseable to retard the timing appropriately if you're going to be spraying that day/night. I don't know the number offhand but there's a recommended number of degrees per shot size that you should retard. Go look that up. Subtract that from your base timing by rotating the distributer.