I had for alittle over a year a 69 26' excaliber (sold it last year) , spent most of the time looking high and low for info on it but came up short.
I do know the design is one of Crelocks early works, it was/is a quick and fast little boat, as far as the motor config goes, it's a OB in a eng well, BUT, not all OB's will work, I was able to drop in a new 20" shafted 5hp merc 4 stroke and that was about perfect, however, make sure it exhausts threw the prop, mine did not and it was too loud IMO.
We kinda wish we had kept it, awsome little boat, classic lines and a total blast to sail; I had a buddy in Dana Point 5 slips up from me who had a 68 that he has been racing for years and does really well
Sorry,not much help, but you gotcha a very sweet boat
1978 Tayana 37
Freedom comes when youíre ready to sail away. True freedom comes when you donít have to return
Cut off from the land that bore us, betrayed by the land we find, where the brightest have gone before us and the dullest remain behind, .......but stand to your glasses, steady,.......tis all we have left to prize, raise a cup to the dead already, hurrah for the next that dies