Pull Timing Boost

As I continue gathering parts for my turbo build, I was wanting to find a budget way to pull timing under boost. I have seen some information on using an HEI 5 pin module that will pull 10 degrees once grounded. The information I have seen uses a hobb switch at whatever PSI you want it pulled. You can use an electronic mopar distributor and eliminate the mopar box. From what I have found, I am going to use a 5 pin module that was used on a 1978 buick regal turbo.