now, i understand that mercury had an engine called a 410. i also know that it's just a 390 with a 428 crank that is externally balanced with flywheel and the harmonic balancer. i just want to know which vehicle that mercury offered these engines in. i also heard that ford put left over 410's in their trucks instead of 390's. if someone could tell me where i could find one of these i would truly appreciate it.