Just scored another Skylark, 4th one to be percose, lol... sheesh it's taking 4 cars just to build one, lol. anyway, this time it has a running motor & tranny in it, BUT I do not know what it is for sure cuz the numbers i've pulled off and tried to run online aren't coming out right or with a clear answer, SO i turn to the gurus of the Buick land, lol. it for sure is a 1966 Buick Skylark air breather says Wildcat 375 number on block: 6Z109038 ( located on the front) number on block: 13745575 (on the back of block where tranny attaches) heads: B1376330J GM M2 exhasut: B-1375907 Can't find any numbers on the tranny, but my dad says it's a 2 speed what do ya all think????