typo? or did you actually mean 302w? A 289, 302, and 351w are all a "windsor" motor. There is one other turd that can be confused for a 289/302, and thats the 255 V8, which i believe was only made for a year or two, back in 1981 or so. 289 and 302 can use the same intake, so you may have to resort to casting numbers by the starter on the block for help there. The intake mani on a 351 is about 2inches wider due to the taller deck, heads being farther apart, and such. Not sure if i helped any, but it may help narrow things down a bit.
2005 F250 CC/SB 4x4 6.0l Auto, Lariat, 6" on 37's
1979 F1Ton EFI BBF, big diffs, gears, lockers, 9", 40's
1982 Mustang GT EFI'd 408W, T5, 373's, 89 interior
1995 Civic EX Coupe, B18C1 GSR swap
2003 YZF R6, K&N, Yoshi pipe, Integrator, flush mounts