i have some local to me on craigslist. i am wondering if these would be a plus or not for me. from jimsperformance.com 3795896 60cc 1.72 1.50 1958-72 283/307/327 idk if that would make too much compression or if they'd even work at all for my car. thanks. EDIT: the add is stating they have 2.02 valves.