The secret to getting a weber cheap is to bid on Ebay for as many decent-looking used ones you can untill you get one. You can usually find them on there with the air cleaner assembly and all the accessories you will need with them. Then once you get one, if it doesn't work well, get a complete rebuild kit off of ebay cheap and just rebuild it. They are pretty simple and easily rebuilt in a small amount of time, requiring a mimimum of tools and some pretty basic skills.
The model best for a stock 1.8 is the 32/36, preferrably with the manual choke, but the one-wire-hook-up electric choke model is OK too. You will need an adapter plate to get either to bolt on to your intake, but if yours doesn't come with the one you need, they still can be purchased from almost any auto parts store or ordered online pretty cheap. Also, if you get the manual choke model, you can pick up a 6-ft generic choke cable at any parts store cheap too.
I personlly like the manual choke model because it's simpler to rebuild and trouble-free. Just pull out the choke to start your truck when it's cold, and push it in a little at a time untill it's up to normal operating temperature. Once your engine is warm, you don't have to fuss with it at all, and your fuel/air mixture can be set more accurately, which improves performance and mileage even a little bit more.
The worst thing you might run into during the whole conversion is having to do a little bit of fabricating on your throttle linkage, but usually by using some stuff off of your old carb and a drilll and a hacksaw, it's pretty simple and basic stuff.
I recently gave Ben a ton of .pdf's with instruction on how to rebuild them, their complete parts list and description, and their proper adjustment, for probably every weber ever made. He has graciously added them here, and now you can download it all from the Info Section on this site.
(While you are there, take a look at the other tech stuff that Ben has put there thanks to the donations and hours of hard work from your other fellow members tracking it all down and sending it in. There is a huge amount of very usefull stuff there, which is why we all worship Ben and this site...lol)
All in all, once you have your weber installed and working properly, you will gain a huge improvement in gas mileage, performance, and despite what you may have heard - they are a damn fine carb, last practically forever, and are as simple a carb to maintain and adjust as you will ever find.
Happy hunting!
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