This will fix your problem. You will love how well it all works and the reliability.
https://www.ebay.com/itm/23659022733....SIM%26mech%3D
And
https://www.ebay.com/itm/26744544544...C18cvSGrpUiue6
Hi-6 boxes are made in the USA, nice stuff. Will get you the same performance as MSD stuff for 1/2 the price. There is a brand new one for 300 $
Built in rev limiters, no chips.
I bought my brother a cast iron sbc distributor for 15$ and a HI-6 for 75$ years ago when he was having HEI troubles on his bracket car. They ended the problem.
This Crane box looks almost new but does not say "tested good". There are others that say tested good but might not look as nice or cost a little more.