I built my '40 Chevy cruiser to drive with a basically stock 350 SBC and 700R4. I don't have to worry when on a long trip about it breaking and not being able to get parts or finding a shop that can work on it. A HEI ddistributor cap is available everywhere but try and buy a left side water pump for a Flathead in Buzzard Puke, Penn. or East Jesus, Texas. You build a car and power it to meet your needs so there are no absolutes.