hey mate

i got a DA3 too n was thinking of an engine conversion. Anything other then a the hyped up ZC motor will need a tonne of parts but it can be done.

B/D series: Info here
http://hondaswap.com/swap-articles/1...view-da-29119/
note. U WILL LOSE POWER STEERING AND A/C
this was the main reason y i didnt do the conversion.
I still have my DA3 and still enjoy driving it. nothing like cars built in the '80s imo. In the end i bailed and bought a DC2 vtir, but i still love the DA3 and still enjoy the easy driving of it. i still have the intention of swapping out the D16A for a B, perhaps 1 day ill get around to it when parts are a bit cheaper.