Tomorrow I am going to get the twin carbies right.
For some reason the front carby hisses much louder than the
rear carby, even when the throttle screw is wound right out.
The throat of this carby has a wear groove where the butterfly rests.
Would this be the problem?
I have a choice of 4 replacement bodies, what should I check for?

That's probably the problem.
Check for wear there on the bodies, and in the throttle spindle holes.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Just check that the choke lever isn`t resting on the "High Idle" screw first.

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

Thanks MiniMan for the reminder, I had wound it out too.

Matt Mini Man is spot on when reading between the lines to analize people's mistakes. Good onya Matt.

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DID I MENTION THAT I AM THE BEST SUPPLIER FOR MINI ELECTRICAL PARTS AND REPAIRS?
"Let us remove your "SHORTS"

oor shucks, thanks Tony ... make me blush now

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

I took the carbies off and upon closely examining them, the front carby had this groove at the top of the throat where the butterfly seated but the needle was slightly worn at the top for about 3mil along it's length.....it was shiny, so obviously the jet was not centered....so I figured the jet would be also worn on this carby......so I swapped the front carby slide and bell into the rear body and vise versa......and it worked quite well......not perfect but much better.....the needles did not bind, but next weekend I'll centre the jets just to be sure.