How much would you charge

Hourly is exactly what you want to charge. And add in materials..... Been down this road too many times and it works out better in the end. You are dealing with an old and aged car so IMO speed is not a priority. With that being said if this is in your garage without overhead then cut the labor to atleast half of what a local shop would charge....

My set price was always my wage at work making overtime and then add 20%. It was a good number and always seemed fair. Otherwise I was better off just punching the clock. But I am not greedy so mileage will vary....

Good luck,
JW