I don't see you having a need for a girdle. We ran a stock VE crank without girdle upwards of 300whp and 10,000rpm revs without issue. I wouldn't bother with the N1 runners. Just get a stock intake manifold. Performance Plus has a plenum with stacks inside to add a little bit of runner length. Trust me man, find a complete VE head. They randomly pop up at good prices.