I agree with Mike, the chrome box will tolerate straight thru way better than the orange box will tho you have ALOT of leeway on what you can and cannot get by with. In '83 I used an Accell super coil, the big yellow beast with an HEI module (75 chebby OE black one/VG piece) with the std Mopar electronic dist with NO ballast on a 440 & it was a killer setup/no failure. (Accel later told me to use either a .7 or .8 ohm ballast on it dont remember exactly). YMMV!