Larry-

Here's an article I found on Google regarding a Datsun recurve kit that talks about 'smog distributors'.

http://www.datsunroadster.com/PIC_PAGES/NEW_PARTS_PIC_PAGES/221-10_24.htm

To recurve the HEI for the stovebolt you'd just have to change the hook shaped weights, springs and centerplate. Recurve kits come with a variety of springs. Here's a link to a picture of a 'HEI recurve kit':

http://www.moroso.com/catalog/categorydisplay.asp?catcode=41012

The question is which weight/spring combo is best for this applaction?

Here's a how-to and why article on 'recurving' your distributor:

http://www.442.com/oldsfaq/ofign.htm#IGN%20Tuning

'51 Chevy 1/2 ton w/'62 261, HEI, offy, fentons, dual carter/webbers, t-5 & 12 bolt posi