Mainly because i'm just not up to speed on the modern hardware that's available.
In my day we used whatever header was on sale at the speed shop :D. Today, these would be considered cheapie headers, and yes the fit is sometimes suspect and they can hang a little low. Seems most prefer the Dougs's or TTI's now days for fit and finish, but they are pricey. I'll just add that I believe a combo like your talking about, would be happiest with a 1 3/4" primary tube.
As far as the ignition, same deal. Although I may be able to comment on timing curves and such once she's up and running, you could get better info from members that are running these systems right now. P.S...Besides the well known stuff, don't forget to look into the HEI setup that member "Trailbeast" ( Greg ) has put together. You could do a search or just PM him if you'd like another option.
If you can supply the fuel needs for that compression, it will surely like it and be even more crisp/responsive.................i'll stay tuned for further developments...:thumleft: