I have an old 650 double pumper that I want to rebuild and upgrade to the hp main body to make it a 750 to use on my big block. The base plate is broken so I will have to get a new one. I have been looking and there are a lot of different base plates and I am wondering which one I need to work best with the hp main body kit. Also will I be able to use the 650 metering blocks or would I need to buy the 750 secondary metering block set up for 4 corner idle adj because I have heard of people having problems because the hp main body is set up for 4 corner idle and doesnt work well with the 650 secondary metering block. I basically just need to know what parts I would need to make a good 750 hp carb from a 650 dp since I will be replacing just about everything except the fuel bowls anyway.