that depends on everything.

for this setup, you will need intake and exhaust manifold, head, bunch of pulleys and belts, custom head gasket and the plate.

For the original setup - not this modified version as its yet to be finalized.
To get the plate milled up in Australia - expect $600 give or take
pulleys and belts ~ $150
head 2nd hand ~ $200

after that it depends on what you want. efi or carb, turbo or not, dizzy or leccky ignition,

like anything this custom, there will be hidden costs depending on how much work you do yourself.

I reckon I'm in this for around $2500 already and I have a box of parts and a bare block on the workshop floor.

Im working towards a turbo, efi, electronic ignition setup - it would be less if you went NA carb.

Do you know a rough cost of the plates and bits and pieces involved? Im currently deciding which way to go as ive already got a built A15 but want to go something turbo and a bit different.

LOL! I somehow knew that you'd buy one, or more likely, an entire carton of them!

Hey Ernie ! Not really sure of hp goal - main one is to not flatten cam lobes and lifters anymore 😀
It should be sitting at about 9.5-1 comp . Not really sure what to expect.

The original goal was to quit messing w/A15 and simply “throw in” the A12 I had laying around, you know how that goes, pretty much full rebuild at this point.

Started taking one last look at A15 issues running in car, now on 2nd new fuel pump , even new Chinese s$@t fails. Frustrating, kinda kills the momentum

Well 4 Datsuns multiple multiple rebuilds over the last 20 years and always looking to go faster.
The fastest carb'd Datsun?
That would be nice.

Nothing like a fresh motor build.
What's your goal for HP on the A12?

lucky that lil wagon didnt get night action or
you would have both gone through the floor!

Cant treat a supercar the same as a datto
and servicing a supercar will cost more than
many engine rebuilds for a datto.

prob already the fastest carbed nissan engined datsun worldwide

Easier to do in sections and tack it ready for welding later

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thanks for fixing the pic's dave, my measurements indicate otherwise as to fit on the right side mount & cross member standoff.

I think the A15 from the back of block to mount is about 8", with the A12 the distance is more like 9.5" - meaning center of mount hole to back edge of block and sandwich plate between engine & trans.

that pushes the mount farther towards the core support by about 1.5", only thing I can think of is making the adapter plate longer that the A15 is using. That s why I was asking about cross members, I always thought it was a stock 73 cross member...