After grinding peened over flats on both sides & then drilling through the tapered pin I was able to remove the cam. The camshaft is too far in & given the drama I've had removing the pin & the fact that it has  run as is for 30yrs I'm prepared to leave it as is . I don't think the adjustment screw on the side of the follower has ever been touched & both the follower & the screw were in pretty bad shape, & there was a heap of play there,& 15thou wear on the follower. I'll see how a new follower fits & if necessary have a bush machined to suit new follower. Just waiting on parts now.