Are those 5.5 or 6.0 beams you got from the Fillmore junkyard?
Something I wanted to do with my 5.8 years ago... My main beam was corroded out at the mast post. I went to the factory to get a new set of 6.0 beams for the boat as I wanted the 8'6" width similar to the NACRA 580 8'4" width. They were willing to do it, but advised strongly against it. It had something to do with the way the dolphin striker meets the hull on the 5.8 and the 6.0 and they would have to fabricate a new one due to the shape of the hulls. Not saying it can't be done, but keep that in mind. Good luck, sound like a fun project
Oh! Something else.. Is this 5.8 a NA rig (bridal foil)? If so, check the main beams and make sure the have a sleeve in them. When they sold the retrofit kit (bridal foil, larger jib, square top sail) for the non NA 5.8 there was a lot of main beam failures. I don't remember what was causing it... but food for thought.
Edit.. the NA retrofit kit did not have the Square Top sail, that came later. And, the cause of the main beam failing (front) was due to the loads being put on it with the square top sail.
Edited by JohnES on Sep 03, 2020 - 05:48 PM.
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John Schwartz
Ventura, CA
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