the more I break down the engine in my '69 mustang, I'm finding that the previous owner swapped out alot of parts, and I need a little advice on the exhaust:

1- The block is a 351W out of a '74 fullsize ford(D4AE-6015-AA).

2- Have'nt pulled the heads off yet, but from the looks of it, they came off a post '77 vehicle.

3- The exhaust manifolds(C60E 9431 F/C60E 9430 F) appear to be for a 302.

4- The carb is a Holley 600cfm

With the current manifolds, the 351 is a really tight fit, and I dont think I would be able to fit a nice set of headers in there. I guess I have to wait until I pull the heads to see which way I need to go when looking for a better exhaust manifold. The ports in these just look so small.

 

headers will fit nicely regardless of motor year .. i have some on mine ..my motor is a 94 model i think

 

My 68 mustang has a Windsor in it w/ headers and it fits great, if I'm not mistaken the engine compartment is the same size if not bigger from 68 to 69.

 

It is a larger engine compartment. You should have no problem with headers.