I have a 75 taylor SS 455 Olds too.
Email Duane Oblander at this link and ask him to give ya a Stage 2 or Stage 3 which he has his own custom grind. I've used his cams for years in my taylor and don't have any complaints and my son uses a similar cam in his Taylor SJ 403.
sales@hi-techperformance.com , doblander@hi-techperformance.com