i had my frame for my 70 442 sandblasted and they didnt remove the sandblast material from the inside of the frame. their is lots of it in their as i can see it through the holes. what is the best way to remove it?

 

Use an air compressor. Starting in the middle of the frame(front to rear), blow air in through all the holes you can find moving toward the rear and then start at the middle again and do the same moving toward the front.

 

It might even take a long piece of thinner hose attached to the end of your blow gun, to get inside the restricted areas.