spudy if you go the L-series route, I have a L20 weber manifold if your interested.

would you have to put 45's in it

Ive got a 2L datsun motor with 4 inlet ports so i might put it in my 1500

thanks for great news

There are no dual-carb manifolds for J-series engine.

Except that one Dman talked about (custom made).

Do you have a manafold for it

I think it's the manifold that will be the real problem. This is a J15 remember.

found these on ozdat
WEBER CARBIES One pair of 40mm DCOE webers. They seem to be complete with one jet cover missing. Ive put matching tubes, jets & correctors into them and they came off an L series 4 cylinder 1800. They were OK on the smaller motor but when we upgraded to a warmed up 1900 we decided to upgrade to 45s.
Price: $300.00 Location: Springwood (Blue Mountains)
Contact: Steve Annabel Email: towbars@pnc.com.au
Phone: (02) 4751 463 (hours: daytime and early evenings.)

I suspect that everyone here thinks it's a 1200 with A15 engine. Anyway, now that that's all cleared up I think that you will find that dual Weber manifolds for these are a bit difficult to locate for these engines.
I have a friend whose son uses one of these engines with a single Weber & it was necessary to manufacture his own manifold. Did a bloody good job too.

How many inlet ports are there in the cylinder head, ... two, or four?

Try these!!
Alfa1750's shop

Damn he's got some good stuff