Boy, does my son's slant run crappy!

'74 Sport said

Are you saying to center punch it before, or after, you tap the tube back in? Afterwards might distort the diameter (and the cross-sectional area) of the tube. Would it be enough to even matter? I don't know how sensitive these circuits are to change.

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Seat the tube down into the casting first. The stake doesn't really colapse the tube it just close enough to distort the roundness of the hole and make it bite the tube. Check the tube for straight and centered in the throttle bores. If you need to shift t tube a little , you can.