Do these things work?

http://www.gesslerheadporting.com/members/gesslerheadporting/ghp.nsf/822dcaaaa26c6da985256dd80023623d/59cf63f17ed65041852573ff00576d6c!OpenDocument

Do these things work?

http://www.gesslerheadporting.com/members/gesslerheadporting/ghp.nsf/822dcaaaa26c6da985256dd80023623d/59cf63f17ed65041852573ff00576d6c!OpenDocument

Yes they do work, but if it is for your 69 I think they use a 3/8" inlet line.
Be carefull to make sure you start it straight and go slow until you have it retapped, then take it out and wash the inlet with brake clean, do not use compressed air as you will drive any filings into the needle and seat.