What\'s this 454 worth? How much should I ask for this 454? It's in a '75 Suburban 3/4 ton 2wd, looks to be original, but unsure of mileage. -Uses some oil and leaks some as well. -Runs fairly good, decent power, but nothing impressive. -No knocks or noises. -Complete, all stock manifolds, brackets, oil pan to intake. I told a friend I'd sell it to him, but I don't know what to ask.