I looked up some of the various 235 distr's on ebay.
If you have the small stock points distr like this one.

http://www.binderplanet.com/photopost/watermark.php?file=17493

Then i would recommend looking at this distr conversion.
The distr looks very close with the exception of the lower shaft.

http://www.binderplanet.com/forums/showthread.php?p=799563#post799563

www.Hamiltonfuelinjection.com
http://www.binderplanet.com/forums/forumdisplay.php?f=75
(injection forum)