1978 thunderbird 302 to 351w HO conversion

So I have a 78 thunderbird with the 302, want to put in a 84 351w HO truck motor with the matching c6 tranny. Besides a different pan and sump does anyone know what other things I will need to make it work? Thank you

The Windsor and 302 are the same block, just bored out larger. Usually a 302 was matched with a C4 which is a different length most times than a C6, so you might need to have your driveshaft shortened. My Dad and I did a lot of 260, 289, 302 and 351W swaps in late 60's early 70's cars with the only changes being the oil pan if the front running gear of the donor car was different.

so my trans code is "W" and from all the research i look up i cant figure out what trans I have bolted to the 302 currently in the bird.

It should be a FMX 3speed, but it could be a C4. Like you I could not find specific information.