Newish to Ford. Had an 84 four banger Mustang as a kid but been Chevy, Yota and Jeep for the last 26 years. Picked up the pictured 99 e250 for my used goods store for $500. It drove home but temp pegged near the last stretch of surface streets driven trip and it started knocking. Previous owner said they found coolant in the oil so I am guessing a bad headgasket and knocking likely lower bearing/s. Who is a good source for solid new or reman 4.2 engines? Thanks for having me.