the pistons and cylinders that increase the displacement to 1641 don't require any other mods that i know of, they are a drop in install.  If you're upgrading / replacing the cam, i would replace the lifters.  Other than bearings, have your case inspected to make sure that it does not need to be align bored.  i've seen people toss an engine together with all new parts, and have oil pressure problems right from the start.  I could inspect the case, but David is the only one in town who has the actual tool set-up required to do the machine work.  I have built a number of engines where the cases need to be align bored, and he's the one i sent them to.  Other than that, gaskets, seals, have the heads checke, possible valve job.... one thing about re-using rods, make sure there is no excessive wear at the wrist pin (piston) end.  you should have a moderate push fit of the wrist pins to the bushing.  if they feel too loose, or wobbly, i would go ahead and put a set of rods in it as well.  some people just try to replace the bushings, but you're really supposed to ream them after installing, as they can distort, again, causing accelerated wear.

Other than that, pick up a good book, like "rebuilding your air-cooled vw engine" as a guide.  they are an easy engine... that means they are easy to rebuild after you've done a few of them, but even easier to screw up if you don't know what you're doing.  they are not as forgiving as a small block chevy.... Germans like those tight tolerances...

Something else that people overlook I have discovered is the oil pump .They are just plain worn out now. They may look good but-------.  I,m replacing all of them now. I think most people do.  Most 1st time builders may think all VW Aircools engines are the same . Not so. So ask somebody thats "been there-done that" for some help. The only dumb question is the one thats not asked.
     Help abounds on this forum and believe it or not some of it really makes since :lol:  :lol:  :lol:

Thanks guys but i dont have the tools to rebuild an engine me and jaime are going to do it at his house. i know he defiantly knows what he is doing. the only thing that concerns me with this whole thing is that i am putting on webber 34 dull carbs and i dont know how to sync them? and Jaime dose not either.

Without question, Check the heads for cracks , Do a valve job(at least replace the exhaust valves)  Valve guides ? etc,etc.
     I would be concerned about duel 34 Webers also.  Have fun with those. You might get lucky about keeping the thing running right.  :roll:

oh baby weber 34's. Toss em int the trash! baby Dell frd 34's work nice I've had several sets of 34 webers and they wont stay in synch for nuthin. If you want a good set of carbs buy dell 36's or 40's properly jetted they run very well. If ya just gotta use weber 34's cross your fingers and hope they are good.

Any duel carb set up is a pain in the Arse. Its always something like working on it all week so I can drive on the weekend.   :roll:

You said it...I didn't listen either....I learned. :oops:
Duels are a pain I'd have them on a sunday driver or dragbug but not a daily.There are so many single carb kits that do just as well for daily driving.