yeah chances are that the engine came with a 170 in it... the car that im working on right now has one in it.. its pretty damn slow lol. that car isnt mine im just working on it for someone. the plans for that one are to keep it stock because besides the paint its really original and it runs really well. hell it even has working AC... GREAT working AC .. puts most new cars to shame.

the 351 Cleveland came out in 1970 and is actually a pretty big engine dimension wise. i wouldnt really advise putting that into a 65 because of the lack of room in the engine bay. personally if it was mine i would look for a 351 Windsor. thats whats powering my Cougar ( 69 Cougar.. hence the screen name here ). the 351W is the same size as a regular small block ( 260/289/302 ) from the heads down but is about 2 inches wider at the heads. ( due to a taller deck ). youll need special headers to get it in there but it will physically fit in there. being as its a 6 cylinder car it has the stock 4 lug front and rear suspension that will actually need to be upgraded as well to handle the extra weight of a 351 ( or 302 for that matter ). as long as you are at it a set of Granada disc brakes will be a good upgrade as well. ( betting that your car has drums.. i have yet to see a 6 banger with discs ) the V8 front suspension is probably the hardest part of the conversion really. finding an 8 inch or 9 inch rear end ( stronger and 5 lug axles as well.. ) isnt that hard to get especially the 8 inch version. alot of people get rid of those and install a 9 inch rear end. its not necessary for a 9 inch right away but when you start making some serious power its a good thing to have. As far as manual trannys for these cars alot of the Mustang vendors still have new parts of the linkages around and they should be able to help you find the clutch pedal assembly as well. the aftermarket has kits that will allow you to swap in a T-5 tranny out of a late model Mustang if you so choose. thats not bad as it will even give you an overdrive gear. factory 4 speeds are kind of hard to find though but they are out there. ( the prices for a conversion for a 4 or 5 speed are roughly the same.. so why not get a 5? ) if you want an auto a C4.. FMX and some C6s will bolt up to the 351W. ( 351 Clevelands as well ). 351Ws arent TOO hard to find. 69 - 73 are the best years for them and seeing as they are related to the other Ford small blocks ( 260/289/302 ) there is a large aftermarket following for them too. they can be bored and stroked as well with 393 and 408 kits widely available ( they can take up to a 427 bore/stroke but its not reccomended for the street... they tend to burn oil at that point ) there are tons of cams and aftermarket heads out there for that engine whereas there are virtually no aftermarket heads for the Cleveland ( lots of cams for those though )

whew... ok that was alot to say but if you have anymore questions let me know. a buddy of mine did a 6 cyl to V8 swap on his 64 Falcon ( essentially the same car mechanically as the Mustang ).

-Steve