My $0.02.. if you don't want to spend a boatload, try changing the head gasket first. That's one way oil can get into the chamber. If that doesn't do it, I'd recommend ls/vtec versus engine swap. If you do everything right (girdle, block guard, etc.), it's reportedly a very stable engine with horsepower numbers that, in some cases, even surpass an itr at the crank. If you're not looking to have sick power gains and just need a new engine, I'd look at a complete b20z from Japan. It bolts directly into your car - electronics and all (as long as same obd version). In fact - someone please correct me if I'm wrong - you may be able to slap in a b20b shortblock and still use your b18b head. This would just give you bigger displacement. Need a b20 head gasket. But again.. try changing your head gasket if you, in fact, have oil in your exhaust. Also.. maybe take it to a shop. A gardener is a gardener and a certified mechanic is a certified mechanic.