Canadian Shipping Fees/Taxes

PayPal CAN do the conversion. There will be a generous amount of fees 8n my opinion thru PP.
As far as exporting from here to US, I would think that there will be some broker fees, but that would come from US side. Similar to when we bought the 67 from Jim in CO, and brought here to Ontario. We did everything ourselves, and the US were not concerned with much other than paperwork 72 hrs in advance and approx $300 US in "taxes".
Feel free to pm me if I can help in anyway.
Oh it's been a few years, but in Ontario I believe there is only one crossing for vehicle export/import.
I'm considering purchasing a car part from someone in Canada (I'm in California) and am trying to figure out how the fees/taxes work so I know how much I need to pay him.

Will I be charged customs fees when the item is delivered? If so, how are those fees determined?

Also, does Paypal automatically do the USD to CAD conversion?