Has anyone done this? I have done all the normal upgrades, Pertronix ignition plate, flamethrower coil, new cap and rotor, new wires, but I still have hard starting issues and late last season it developed an issue of cutting out at high rpm's. I know its not a fuel issue as I have a new Holley 4160 and fuel pump with regulator set to 7lbs. Anyhow I am going to replace the distributor with a new marine HEI unit. Has anyone done this mod to a 351w? They are pretty pricey but I think my prestolite has spring and weight issues and I don't really want to put any more money in a 30 year old distributor.