well if it is a FULL engine rebuild then it should be ok depending on whos done and ask for receipts for proof mate if its been sat in dry storage then happy days but still have a good poke around underneath sills chassis legs boot ect just a general look around, and if your going to look at it ask him not to start the car before you get there so you can see it started from cold and looks out for smoke nocks bangs ect, oil filler cap for mayo type gunk im no expert but thats what ive been told mate and then if you drive it just listen and feel for anything abit dodgy but they are old so the od rattle ect is to be expected!