1994 E-150 van / 351 Windsor questions
 

Working on the van is a bit of a dog as the engine is stuck in the middle of the firewall.

I am replacing spark plugs, should I do iridium for the durability? Or just stick to copper and get 30k out of them? Windsors typically took coppers to begin with out of the factory. Just don't want to do them again, ha.