I run points on our L78 with the same curve as Rob, all in by 3000 and idle it at 900 rpm. I ran the 427 the same way. I run a stock 429 B-R coil. The HEI died a couple of years after we bought the car and I had a 1111498 distributor on the shelf so that was used. You will be hard pressed to notice whether the last number is an 8 or a 9 with the unit installed. The car starts fine and will turn any rpm that I wish to run. I used to run the Delco D112P HD points in the old days. No problems to 6500. Now I run the Accel HD points, not the race units, and have no problems. So I change the points every 4 years. That's part of the fun of owning these cars. I've run the stock 4346 carb with #73 primary jets and #76 in the rear. Power valves front and back. Fine tuning on a chassis dyno might find some gains, but this is a pretty good ball park to start with.
If your HEI is in good condition, just ad the GM 990 module. Apparently the early modules had their problems. New modules are as close as your nearest GM dealer.
