Just put a set of Mr gasket d250 springs in my stock 292 with 4v/ I also have their timing tape on damper with initial advance set at 10 degrees  / total adavnce at 2000rpm is 48 degrees , when I ran it up to 3000rpm Im over 60 degrees / car runs great but Im worry that thats to much advance for old eng./ Not sure if  I should try adj vacum advance can /or just put the old springs back in/  Im not sure if thats to much advance or not /any ideals?