Theorangeslug

ok so I have a eg hatch with a b18b1 with a1 head it has full exhaust with Magen header and aem intake. I have gotten my nitrous hooked up, and I am just a little confused on what jets to use the 50 or the 75 I am using a wet ket. Other then that it's a stock block and head. Been told I can use 75 just don't wanna blow or trash my rings.

My second question is does this sound like a good build plan for a 125 or 150 shot. Planing on doing cp Pistons with eagle beam, arp studs and rods studs, acl bearings, port and polish head. Yes I have looked into this a lot just looking for some more info. Thanks in advance.