never seen one of those before either and ive had apart standard early a12's through to a15's wierd

i think its to warm the mixture up against the bottom of the manifold

Well I'll be danged, none of mine have that. What it does though is allow the mixture to speed up before it's mixed and distributed to the cylinders, I would like to make a tube suitable for my 32\36

here what the original one looks like

she's manual choke mate

make sure two things are true
1. you have power and ground at the choke
2. that the choke is adjusted correctly

well starting cold has gone out the door and it runs like a bag of s**t now. but as for fuel economy i'm getting the best i've had since i bought the car. ah well a ca will fit in there quite nicely soon enough

Yes, that will change the performance ... for the worse. You won't notice much change though, more likely to notice your fuel costs go up a bit.

its under a stock carby ... ill post a pic up tonight

Aluminium pipe??!?

I know what you're talking about but I haven't ever seen one with an aluminium pipe. If I recall you were after a stock carby.

I wouldn't expect any power loss.

Maybe pop up a picture.