You may need to re-locate your coil, as the stock position fouls the hex bar. If you still have the platform for the stock air filter that will also need removing. Depending on the banjos that the carbs come with you will probably need a T-piece and some extra fuel pipe.
As well as the book...
I upgraded my stock 1600 to Dellorto 36's a few years ago and love them! Teamed with a decent exhaust they give a noticeable improvement in pulling power, particularly useful for hills and make cruising at 40-60 much easier.
You will need some additional hardware, such as new inlet manifolds...
There is also the possibility that debris in the fuel tank is blocking the outlet. This would explain the hot running (lean due to not enough fuel) and the intermittent nature of the problem as the debris shifts around.
Also check for any air leaks, mine was running hot and backfiring on over-run due to a leak where the exhaust manifold joins the head, I also had hot running just before my fuel pump (cb rotary) packed up.
Maybe get yourself a couple of books to help too :)
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