would a d16a6 drop straight in to a d15b7 angine bay and bolt up to a d15b7 trany

 

do i have to replace my ecu and wire harnes? any chance you have a link where i can read about it and/or learn how to do it?

 

If you use the car-correct distributor and thermostat housing, it is practically a bolt in.

The differences in the engines are 100ccs, and camshaft. You can run either engine on the other's program just fine, although I do recommend tuning to suit. *shrug*