I know VW's have aluminium heads, so hard valve seats are already inserted so using unleaded is reasonably straight forward, but curious if there are any changes in plugs,hot/cold,etc or also if gaps are different from leaded to unleaded using Bosch W8AC Spark plugs,I have searched internet but have found limited information,any help appreciated, Thanks

The plug gap and type (heat range) requirements shouldn't be different for unleaded v. leaded.

There was a discussion including the various types of plugs (Bosch, Beru, NGK) that are available/work:-
http://forums.aussieveedubbers.com/viewtopic.php?tid=105423#pid986101 

Very helpful,thanks Brutus,seems in some ways Volkswagens thought to make alot of things easy,also curious about limited information about my Vac Advance Distributor code- 0231 168 005 - 021 905 205P which I can only find on 1979 Type 2 Bus, even spoke to Mick at Mick's Motors about distributor and he wasn't sure,parts I bought for the distributor are the same as 009,cap,rotor,points,condenser

From what I understand, it seems that all the VW aircooled engines from 1968 were built with hardened valve seats to suit unleaded.

All VW had hardened valve seats and valve stems. It's because being air cooled the extra heat made the quality materials a necessity. In the Berg literature, Gene Berg mentions that cam profile designs changed in 1964 that promote better ex valve cooling and he uses this date/change to claim unleaded compatiblity. I never use or recommend any fuel aditives for use with unleaded fuel, it's just not necessary and is a waste of money IMO.

Update,so I far have changed, points,dissy cap, rotor, condenser, plugs, leads, coil ,air filter, flexible fuel lines,cleaned carb, it winds over alright, but only half fires on one cylinder, starting to think that the distributor might be the next to replace, I know this might seem a stupid course of action due to this motor was a unknown project from the start. This engine was bought in a donor parts bug that I only need a few other parts including the 1600, it will be rebuilt and upgraded before going into project Bug,but after driving,repairing and have lots of fun in water-cooled junkers to supercars cars from all over the world for many years I thought aircooled would be simple enough, but to quote one of my service manuals 'vw engines can be fussy'.

Have you set the valves and checked compression yet mate? How long has it been sitting for? If the comp readings come back low a squirt of oil down each plug hole can do wonders for stuck rings etc..

Have you taken each plug out and held to a good earth whilst cranking to ensure a nice fat blue spark at each plug?

Just cos parts are new don't mean they are any good these days especially with many of the VW parts suppliers selling cheap Brazilian/chinese tat. I remember once buying new plugs and each and every one was DOA just like a graphics card brand new from Harvey Norman. It happens more than you'd think it would these days

vduboy haven't done any aircooled internal adjustments,also I don't have a decent compression tester at the moment,psimitar i know what you mean about new parts quality,all parts except for coil were bought from Micks motors,also hard to check alot of things during cranking engine when I am a one-man-band, have get back on my cloning project but still scared that more than one of me will be a problem

Setting rocker clearances is a must from what I have learnt. .006 thou at stone cold engine.