Drawn a blank so far this end, although I have one last chance on Monday, but not holding my breath on that.
So, I've discussed this with so many people now and there are options, but none are super-easy.
(a) Convert back to v-belt using an earlier cover all the associated ancillaries (steering pump, alternator, etc etc). All bolt-on and someone might do you a deal on the parts package. All basically bolt-on, except I'm told for the AC lines.
( b ) Convert from distributor to a GEMs (as per the later models. Lots of wiring and ECU changes -- more than I'd want to do.
( c ) Convert from distributor to aftermarket distributor-less (using a Megasquirt or similar), Often done by the custom boys in the U.K., but needs a fair amount of time and effort to get it right. Guess you don't have too much of either of those. You'd have a real powerful combination though, with the ability to program with a laptop based on established parts. Also less prone to water-based ignition issues.
(d) Mill out a later cover -- this doesn't seem that hard to me, but I'd need a pattern (your old one). You could also cut and weld two covers together if you know anyone handy with a TIG welder (sorry, I can cut them, but my welding of aluminum isn't up to that).
Edited by GraemeWare, 21 August 2015 - 07:05 PM.