I went with doing the gm 250 cid hei because of the cost , cheaper from the auto recyclers than from another vendor. Plus it is easy to do.if one cant do the mods easily then buying a dist already to go is the way. Again you will be happy going with hei.you can do a pertronix conversion and get the stock look go with a hotter coil and it will work too. Be sure your dist isnt worn out and vac advance works.