well here goes....... okay you found the spot on the dist that says autolite, right around it is some cast and stamped numbers. the stamped numbers should be like C5OF and then it will be cast 12127 and then another letter or two. this is the part number of the distributor and tell what it was designed for. also stamped below that will be another number like 5D13 this is the date code (5 would be 1965, D would be april, and 13 would be the day of the month). the block has the same kind of numbering above the starter and you really need to pull the starter to see it so i would wait until you need to (it doesn't really matter as the number most likely won't tell you if it is a hipo or not as they pretty much used the same numbers with a few exceptions, thats why i was saying the guy was blowing smoke!). the inner fender number is stamped directly into the front inner aprons and can usually be seen on the drivers side as there is a notch in the fender to expose it. if the apron has been replaced there will be no number but it may also be stamped on the passenger side under where the fender bolts on above the hood hinge and that part rarely gets replaced. there are no vin plates on an early mustang, there is a warantee plate on the door and then the vin is stamped on the front aprons (actually both sides but you usually can only see the drivers side) and a buck tag that can be mounted in one of several locations depending on the assembly plant. metuchen cars tend to be on the passenger side along the fender edge by the shock tower, dearborn cars tend to be on the radiator support behind the passenger headlight, and san jose cars rarely have them. if you have never done engine work don't take the valve covers off until you have a little experience, some help, or a good shop manual as it will be an oil leak forever otherwise (i am assuming a low level of experience or we would't be having this discussion in the first place). tri Y's were also never used on a stock hipo in a mustang but were part of the cobra kits and standard on the shelby's. they like the rest of the stuff you have are a popular swap and for years were available as part of a cobra kit ford sold and are still available from many sources. since you have headers you may be able to look at the bottom edge of your cylinder heads to see if you can find a number 4V cast along the lower part. i do not have a head here now to look at but the hipo head has the 4V cast between some of the short headbolts along that edge. i remember it is about 1/2-3/4 inch tall or so and and is just a 4V with no other info (i was told it denotes 4 barrel hipo but that is hearsay). i have never seen a regular head with a marking in that spot (but of course now that i've said it.....). hope this helps, hawkrod
