All depends on what your satisfied with at the end of the day. If you want a h22 then h it is. The only thing is when you start putting different engines in it causes issues and the way the box mates up to the Engine I've read it makes the shafts sit at funny angles n kills them off n what not. You either do it cheap or you do it right. If I was looking to do the h2b build, I'd be looking at having 5k tucked away for it as youl end up wanting to Change bits along the way and spending £££ For example the clutch, brakes, exhaust manifold, inlet+ possibly manifold, then the engine will need a full service with possibly the cam Cover seals n few small bits doing. It ends up costing a fair whack. H2b kit Clutch Engine service parts S300 or ecu Remap and tuning Added expenses (drive shafts, etc) Upgrades (wire tuck, after market add ons)