Until a few years ago, there were some nice 40" ranges. No more.

Vintage O'Keefe & Merritt Stove, but not sure if they made an electric stove...

Here is a GE one on Ebay.

https://www.ebay.com/itm/Vintage-Kitchen-Range-Stove-GE-40-inch-BEAUTY-60s-70s-WORKING-RETRO-KITCHEN/113743378384?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D1%26asc%3D57922%26meid%3Dee9682519df1430b946350fcabec55c5%26pid%3D100005%26rk%3D1%26rkt%3D12%26sd%3D183845262082%26itm%3D113743378384%26pg%3D2047675&_trksid=p2047675.c100005.m1851

What are your countertops?? Can you do a 36" unit and install 2 fillers and 2 small pieces of countertop material to fill in the difference???

Ideally you would upgrade the whole kitchen - 40 years is a long time...

Hopefully you can figure something out>>

You can find larger vintage electric ranges from time to time, but they certainly don't have the cachet of the gas ones. But most of the usual suspects for restored gas ranges do electric, too, when they think it's worth it. However, that's a lot of money for what you'll get, unless you can size up a crudder and know what it will need, so I wouldn't go that route unless you're quite sure you want to keep the rest of your kitchen forever.

Here's a list of places to buy a restored vintage range. The page is older, but most of the links still work.

IMO old electric stoves were never a good choice and to get parts now is often impossible I think we need to see the kitchen to comment and I agree a 40 yr old kitchen is probably due for a makeover . If you desperately need a stove then get a 36” one for now and svae for the redo I would also suggest you go induction but that might require some electrical to be done in an old house for sure.