both engines are a great idea. the GSR B 18 is the better of the two however they are harder to get a hold of. the swap is no problem either. there is alot of reaserch on the subject and many aftermarket companies make the motor mounts and conversion kits. one of the easiest ways to figure it out is to buy a book barns an nobel sells a honda tunner guide that lists the exact steps and even gives you the companies that make the kits check it out it is a lot of fun.