Mark;
I don't know if this is relevant for you at all, but I uploaded Volvo's old tuning brochure here. You will find a few pages listing the parts they used for the various tuning stages, usually including twin Webers. Mostly Swedish text, contact me if you want any translation assistance.

Erling.
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My 240 Page

Is the K-Jet not working? There's blessed little that can go wrong... If you need relays I have spares.

Anyway:
Remove the K-jet Stuff.
You can either replace the fuel pump with one block mounted or re-use the old and get a heavy-duty firewall mounted Holly FPR like a friend of mine did.
Vented filler neck cap
Leave in or otherwise plug the block coolant temp sender and the sender in the downpipe.
Install carbs, route your PCV and hook the vapor expansion line to whatever your conscience dictates: open air or the carb airbox.
Pop 7/8" freeze plugs in the injector ports, or seal up some nickels.

Your linkage will need some finagling, as well as AT kickdown cable if so equipped. And you'll have to look at a wiring diagram to slim down your wiring harness some for the various fuel pump relays.

Do give K-Jet a second chance though. I find it very efficient in economy, simplicity, and it delivers decent power. Near-perfect plugs every time I pull them, 23mpg freeway.

-Sean
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1966 122s, 1970 142s, 1974 142e... Blue is Beautiful