A lot of Z's on FleaBay
http://motors.shop.ebay....amp;_nkw=zenith+updraft
Should be able to get what you need.
Also give Kim a call at 630-485-5007 for GrayMarine parts. Tell him Mike in Alabama sent ya.
They bought an old parts disto and have a lot of old parts. Got my rebuild kit for carb and fuel pump from them.
You will for sure want to rebuild the feul pump. I think it is the same on your motor and mine. Pay attention to the way it comes a part. The linkage inside the pump that comes from the cam to the diafram is easy to reverse. I did this on mine and thought something was hokey and when I put it in the cam was pushing it out and could have cause the block wall to crack or bust. I did bend one of the small pins inside the pump but I just put the old one back in since it was not to worn out. Also watch how the springs (2 of them) come out. Take pictures as you go and lay the pieces out in a line.
On the carb, make sure you have cleaned out ALL passageways in the carb. I could not get my small brass pieces out and when I first rebuilt the carb had issued on the low end. I put another bottom end on the carb and it fixed the issue. I am sure trash was inside somewhere I could not get.
So you may need to round up another rebuildable Z carb. But at least Z is still in business and fleabay seemed to have quite a few.
Looking forward to seeing you 54 running !!!
Glad the 59 could give you a boost. Noe if I can get inspired to paint in this dang heat !!!
Mike Ray
1959 Family Cruiser
Central Alabama