Weber carb jetting

[mpl_gr]

I have twin weber 34 ict's fitted to my van which runs a 2.o cu engine, I know they don't have the best rep for these vans but I can't afford to replace them at the moment.
Anyway it runs like a bag of the preverbial, back fires through the air filters and has bugger all power under load. Ive been told that the carbs probably have the wrong jets in which makes sense to me but I can't find any info about what jets they should be and the best place to buy them, I'm a bit rubbish when it comes to the internet.
Any help would be much appreciated.

[toomanytoys]

ICTS work well.. its the central mounted webbers that are pants...
all engines are a bit different.. best suggestion would be to get your self down to a rolling road and have someone set them up properly.. just bunging in new jets may or may not be the right direction.. of course, the engine needs to be in good fettle to.. so leaking exhausts, poorly serviced etc etc wont help the setting up...

if its driving quite well and not drinking the fuel (but also not being really economical) then they cant be far off as is..

[mpl_gr]

ICTS work well.. its the central mounted webbers that are pants...
all engines are a bit different.. best suggestion would be to get your self down to a rolling road and have someone set them up properly.. just bunging in new jets may or may not be the right direction.. of course, the engine needs to be in good fettle to.. so leaking exhausts, poorly serviced etc etc wont help the setting up...

if its driving quite well and not drinking the fuel (but also not being really economical) then they cant be far off as is..

Thanks for relpying.

I haven't had the van long and it's my first so unfortunatly when I looked at it I didn't realise just how poorly the engine was running.

The engine is currently out of the van as I have just done a complete service(looked like it hadn't been done in years), both heads off and the exhaust valve faces machined and new valves fitted as they were badly burnt and leaking like mad.

I read somewhere that the ICT's weren't originally designed for these vans and as such are incorrectly jetted which can cause problems, unfortunatlly I can't for the life of me remember where I read it.