ignition choice for 505 big block?

I agree MSD.Put them in both cars about 15 years ago.Still going strong and the dist is easy to set up.Rocky

I've been running a Mallory HyFire VI-AL # 6853M with their recommended coil and 32 series distributor. Installed it about 8-10 years ago and basically forgot about it! Never a problem from any of those components. Of course, they have variety of other VI and VII series boxes to choose from as well.

Mallory HyFire VI-AL - Summit source

I've been using MSD stuff since the late 70's and have yet to be disappointed.
Like Mr. P sez.......look around the track and see what is working for others.
My latest is a 6 AL 2 programmable and I haven't lit it up yet , but it has way more features than I have a use for.
I went this way over a regular 6 AL so I could map the ignition curve with a locked distributor , but this thing has enough limits and retards to do pretty much anything you would want to without going up to the top shelf of ignitions.

Just picked up a 7al3 analog and an HVC 2 coil 8261 trying to decide if I want to send it back and go digital / programmable

Its tuff to beat MSD. It gives you multi spark and helps keep the plugs cleaner. That said I still run the MP orange box on my 63. I bought the box in 1998 and it has been flawless since then. But from what I hear the newer orange boxes give alot of trouble. We took this orange box and Acell coil off my sons Dart and put MSD on it in 2006 and his Dart ran the same et and started and idled the same. But I would still rather go with an MSD box and plan to when I get the cash. Course this orange box works fine and never misses a beat for me shifting at 6200. My dist is a Mallory electronic unit which works very good and I like it alot. I use a stock dist on my boys car with the MSD. And like was said you can get MSD parts just about anywhere. So I have no complaints with my orange box but do plan to go to MSD when I can. Ron

Been runnin the same 6-A box forever...........MSD dizzy also locked out.

I use a simple Mopar distributor setup with no vac advance and a chrome box.

10.4/1 470".

No problems

I think you can still get the chrome box at a dodge dealer.

I use the rev a nator on my 505 and cant complain of how it preform and a great benefit is of corse the built on rev limiter that WORK ! Had a new MSD soft cut rev limiter before whit a no good orange MP box and that limiter whent in the trash as it dident work together whit no good MP box. I gues you can reed some test´s where they compared the AL6 box to the rev a nator and diside for your self whitch to pick Im afraid you will end up whit recomedations of useing retrackted race plugs to in the heat range around 8 if you askt that to in a topic that i gues works fine if you only intend to rev the engine above 7000 rpm at the track but they will most likely not give you what you whish on the street if you even come out to the street before the plugs are shut down IMO Spend money whit respect and reed betwen the lines some times is my experience.

I decided on the rev-n-nator. The rev limiter will be nice also. Car is 4-speed. Thanks guys