Join Date: Mar 2002
Location: Austin, TX, USA
My kit came with those thin plastic "seals", but I couldn't get them in so I left them out.
To steak the screws use a center punch or chisle. Screwdriver might work but you might end up chipping the blade or cracking the handle. On the other hand, many a screwdriver has been used as a chisle.
I'd try to apply support to the back of the shaft if you can, for good measure. Also, turn the idle stop screw out to the point that the blades close completely before tightening the screws. This will help them center up in the bore. But I'd open them up a tad before whacking them. You don't want to booger up the inside of the throttle bore or else the throttle blades might stick or mess up the idle passages.
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI