What are you leaning towards , the dist is reliable so Why trash it
I have used the Mopar Chrome boxes with Pretronics or MSD balster coils
I am not a fan of MSD , the cost is silly & the performance is mediocre , if you want that type of system why not use the Mallory digit box for less than 1/2 the cost & it has the rev limiter built in & it is adjustable with dials not expensive chips