All in all, it will be less money spent to have your old vacuum motor rebuilt and they work very well once in top notch condition. You can probably even get a new fuel pump plus the rebuild and still keep it within the cost of the electric conversion although mechanic rates could take it over.
If you do decide on electric, several have used the Newport electric wiper conversion
https://newportwipers.com/product-category/cars/packard/ and those work fairly well.
Biggest downside is the Newport switch is now electric so you have to give up the stock cable operated assy. You also need to order an optional switch to control the washer. The new switch fits in the same 55 dash location and can use the knob and bezel but you need to either find an extra lever to modify or cut your old one to use as a fill piece to avoid an ugly dash. That cutting prevents reverting back without finding another Packard switch or lever should you or someone else decide to go stock again.
Another thing is because there is no longer a way for the windshield washer co-ordinator to mount and control the new motor you also lose that function unless you build a special module to keep both coordinator and switch. I went that route mostly to see if I could do it and because any mods I do on my car I want to be easily reversible for the next person.
https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?post_id=157986#forumpost157986 An option to the Newport is a 55-6 Chevy electric wiper motor which will bolt right on and keep the cable and coordinator setup but those motors are large, hard to come by and fairly expensive when you do find one. They are available though.
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