1966 Skylark w/ 1971 350 swap looking for original numbers

[66skylark3504]

i'll give u the numbers in about a day so i'll have info looking for the original engine for my 66 skylark 2 dr hrdtp.
it dosen't have the same engine in.. they did not make a 350 in 66 for the skylark... looking for what came in these stock

[sean Buick 76]

The 350 was first put in the 68 and carried through to 80, so there is no 350 motor that would seem stock.

[wkillgs]

Stock V8 was 300 cubic inch with a 2bbl carb.
Optional was a 340 with 4bbl.

If you have the original warrenty booklet, the protecto-plate would have the engine code stamped on it.