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Chinoy ignitions are downright crap. Believe that is why economycycle discontinued them some indian members also tried them, better than stock but no where compared to MZB.my 

My coolant seems to get used up on very short runs , I end up having to fill the radiator frequently.  I don't see any leaks when i park the bike and there seems to be no steam coming out of the radiator overflow pipe either.

Right.thanks.what about the timing settings? Since I am using the RD400 con rods with a spacer underneath the cylinders.

Stock VM 28 specs for RD350.

Not sure about the jet tube but I think they are the stock size.The air filer is clamp on K&N on the Y boot.

I am running a 350LC top end , with a 5mm spacer on RD350 LC long rod bottom end with stock exhaust.

my question is what changes do I need to make for the timing which is 1.8 for RD and also I read somewhere that the 81 LC uses 200 main jets in stock form while the RD  jets on the the VM 28 are 140mm. Do in need to change the main jets then? Thx!

not necessarily. that being said, you would then need to build a rail and linkage arms and fabricate adjusters . huge pain in the ass. and then you would always have to pull all 4 carbs at one time.

I believe there are carbs which come with pre-made linkages, like the Mikuni RS series?

Wouldn't a single cable and pulley system  provide better synchronization to the carbs?

Thanks.and about the carbs? Any upgrades? Would it be better to move to small carb like a 30 or even 28 to get better low end.....

  Best and easiest to get solution is a dual cable throttle and then two splitters.  TZ750 throttles are out there, but rare.  KZ1000 is a horse of a different color and not at all applicable;  One cable, activating a pulley connected to a shaft that works 4 carbs that are bolted together in one solid bank.

Thanks.splitters? What are they......a website link perhaps....

After getting my hands on the hard to get Manifolds and reeds, I am now thinking of

1) which carbs to use( stick I believe are 34mm) for a good low end
.2) should I  use a single wire throttle body like the KZ1000 connected to all 4 carbs or try finding a 4 wire stock throttle. Thanks.

maybe im missing something here, but whats going to seal the combustion chamber? 

The O-Ring
This is just to keep the water from leaking outside.

Copper gasket. Fingers crossed.

Template for a 0.4 mm copper gasket.

Something like this could work?
https://youtu.be/Zq4l0sj7sbQ