Update
3 front covers will be ready soon, 2 new headgaskets will be available by the weeks end so far 2 kits will be available to guys who have been putting their hands up first (both american members) and one for myself for my big bore A10.

There is an easy off the shelve mechanical waterpump that can be used and looking at ebay there housings which are also necessary to use these waterpumps are still available from the USA and some other countries. Those who are buying the kit will be given every bit of information to facilitate a successful build.

Also update on the heads, the early 1300 and 1500 using 73mm bores have no clearance issues using the original pistons or daihatsu HD pistons but the 1600 heads have one inlet valve that touches the edge of the bore so the bore will need to be notched to clear this inlet valve when using these bigger valve heads however if going bigger than 76mm by using the mazda b6 twin cam head pistons of 78mm there wont be any notching to be made providing the bore walls match exactly the factory bore spacing of the 1600 heads. That would mean 2 and 3 bores will need offset boring inwards to suit which is also where there is most meat available on A series bores to help.

Im using the Z head for the A10 and since the Z head has more valve angle they might no clear as well but have noticed exhaust valves will have no problem just inlet valves are big so might need to small notches on deck/bore edge which is no big deal.

I dont have final costs of the headgasket and font cover kits but will do so in the next few weeks once the originators lathe is back up running to finish the front covers.

For those looking at doing this conversion take into account which head you want to use as the B series heads come in many different flavours and also the Z comes with 3 types to suit 4 different Z engines one with VVT which I dont recommend unless you run factory ecu.