shot peening a distributor gear for a roller camshaft

What size pin would you use I think it's a 3/8" hole? Not really sure. I read somewhere possibly on for a bodies only, just use a drill bit and snap it of once it's through the shaft?
I'm running some pretty heavy valve springs I currently have a HV pump in it but will be replacing it with a regular pump once it's broken in. Will be running 5W20


You know, I’m not sure what size that pin is and IIRC it’s a tapered pin.
I have a drive at home but I’m not there until Friday at the earliest.

I know if I were going to pin it I’d used a tapered pin.