Using the G63B/4G63 will limit your options. The 4G63's are a narrow block configuration (all of them are sourced from FWD cars) The G63B came in the trucks and early vans of the same model/year builds. You could use a 4G64 from a Gen 2 truck (they are wide block) and neanderthal the engine by using the intake and distributor off a G63B truck engine. Bear in mind you will need to source the flex plate and starter motor for the auto set up + get a carb that has the kick down linkage on it. This isn't going to be 'straight forward' but the only easy option is to simply find an auto configured 2.6 and drop it in...