Yep the original Ford pins were longer than what you get now. My dowel pin that came with my Rollmaster timing set is also 1.5". Add also that some aftermarket cams have the dowel hole drilled a little deeper and this adds to the length coming up short. You want the dowel to engage the eccentric and also be sure the cam bolt washer covers part of the hole so the dowel can't walk out. Those dowel pins are hardend tool steel. You can try a few machine shops or GOOD hardware store to see if they have anything. longer and or something make your own. Use a little blue loctight on the dowel pin and cam bolt for final install. End result it's a pretty common thing to find with the non correct hardware we get. Even the ARP stuff is not the exact same size as oem. Good luck.