I have a mercruiser that I'm pretty sure now that it is a 470-488 and I needs tune parts, points and condencer,etc. These appear to be delco-chevy parts. Can I just get points for a older chevy and use .I have no spark and I've cleaned the points, they were closing. I hot wired the coil and no spark so I will probably put a new coil on,it has a screw on wire cab.