I called my friend today to see if he can remember where the cam came from. As the engine was built in 1993, his first reply was unprintable. After a bit of a chat, he said that to the best of his recollection, the cam was from camtech. Probably an old catelogue number. As Im not too sure what the cam is worth, & don't really have any plans to use it, if you pay the postage, you can have the cam. Though, if you had a set of washers that sit under the twin valve springs, I wouldn't mind swapping.
Just so you know, I've also found a stock late style cam if you want to go back to your original plan. & 2 54/86 cams ( 224a's) if anyones interested.