hello, so i am looking to put a different engine in my 86.5 till i can finish its engine. My problem is the motor i want to put in has the numbers m-28 42 and 81ho6625 , head numbers 413 1r ,and cam 292 6r what do i have here or where do i look it up? Of course its not that easy because i just noticed that the threads for the lower oil line have been partly broken away, is there any fix for this. I think this is a big crap! but please loet me know if there is any way out. thank you for all. Ray