well......being you could get a 289 in a 1965 mustang new.....and a 302 is exactly the same size......exactly that is......as a 289......then Of course it will fit!......a c4 tranny?....Most came with a C4....or a three or four speed standard. Its a simple bolt in installation if you have the V8 motormounts particular to the 65-67 mustang. You will also need the trans crossmember and that's about it......If I'm right in assuming the C4 you mention came from the 1980 302. If its from a six cylinder, you will need to change the six cylinder bellhousing for a 289/302 bellhousing. and that's it....have fun.
220 horsepower for the high output 302 in a 1988 Ford Mustang
302
My 1991 Ford Mustang LX 5.0 L ( 302 ) was rated at 225 horsepower
200hp
( .054 inch ) according to fordparts.com for the 5.0 liter / 302 cubic inch V8 engine in a 1992 Ford Mustang
From the factory ( 220 horsepower ) for the High Output 5.0 liter / 302 cubic inch V8 in a 1988 Ford Mustang GT
141 horsepower
205 horsepower
A diagram of the firing order for your 1969 Ford Mustang 302 engine can be obtained from most Ford dealerships. The diagram can also be found at most auto-parts stores.
1968 was the first year the 302 cubic inch ( 5.0 liter ) was used in a Ford Mustang
My Chilton repair manual shows ( 5 quarts - U.S. ) WITH FILTER CHANGE for the 302 V8 engine in a 1976 Ford Mustang II
The ignition timing for a 1970 Ford Mustang with 302 - V8 - 2 barrel carburetor is : ( 6 degrees BTDC )