Bushing on shaft under mechanical advance?
Slow was a poor term. "Long" would have been better, but "Long and slow" came along with each other in the "smogger" days. They came with a strong spring that didn't allow much advance, and a "STRONGER" spring that had a huge slack eye in one end that allowed one spring to allow "some" advance and then the "slack eye" STOPPED the advance until very high RPM
You can see a couple of these at the far right in the photo below
You can most certainly weld those up and recurve them. Here's a chart somebody......may crackedback drummed up........that shows approximate slot dimensions to advance degrees. These are in distributor degrees
Dimensions for Mopar distributor slots, in DISTRIBUTOR degrees
Modifying advance slots
degrees / slot size
6.............. .340
7................355
8................375
9................390
10...............405
11.5 ...........420
12...............435
13...............445
14...............460
15...............475
16...............490
17...............505
18...............520
I've actually got an Allen distributor machine if I ever get it back together...........
Check out the thread, I'm using parts of a Mopar distributor to trigger the tach circuit on the thing
http://www.forabodiesonly.com/mopar/showthread.php?t=216539
Slow was a poor term. "Long" would have been better, but "Long and slow" came along with each other in the "smogger" days. They came with a strong spring that didn't allow much advance, and a "STRONGER" spring that had a huge slack eye in one end that allowed one spring to allow "some" advance and then the "slack eye" STOPPED the advance until very high RPM
You can see a couple of these at the far right in the photo below
You can most certainly weld those up and recurve them. Here's a chart somebody......may crackedback drummed up........that shows approximate slot dimensions to advance degrees. These are in distributor degrees
Dimensions for Mopar distributor slots, in DISTRIBUTOR degrees
Modifying advance slots
degrees / slot size
6.............. .340
7................355
8................375
9................390
10...............405
11.5 ...........420
12...............435
13...............445
14...............460
15...............475
16...............490
17...............505
18...............520
I've actually got an Allen distributor machine if I ever get it back together...........
Check out the thread, I'm using parts of a Mopar distributor to trigger the tach circuit on the thing
http://www.forabodiesonly.com/mopar/showthread.php?t=216539