Depends who's doing the work, for t2 you can pick up for 4-500 second hand, 625 brand new and a basic loom would do, so not silly expensive, just reliable and for us nice to map.

James, I bet a atmo yb would be cheaper to do between 200-250bhp then a Honda, as no need for a dry sump, other wise most bits are the same. And it can be done on a 205block engine which you can pick up for pennies