Welcome! Another one of my Grandads Morgans (he will have built some of your wooden framework)

Firstly, my recommendation would be to avoid accuspark and get a decent electronic dizzy. I recommend H&H but 123 are good as are Aldin.

Wheel cylinders are readily available (check eBay for bargains), but drums are stupidly expensive. See if you can get away with a refurb.

Arwyn will be able to help with alternative part numbers and such like, but some bits are Morgan specific.

And be very pleased that you have the best model Morgan ever built (opinions do vary)

"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10