1981 K10 would have come w/ intergral head 250. 292 we're never built w/ intergal head, only late 4.1 (250).
292 would have come w/ a Rochester Monojet (1981 20 & 30 series model 1ME0, carb # 17081009, 17081309 & 17081329), all 1bbl. If you want to say 1bbl I like rochester model "B" (1967 and eariler) better than monojet (1968 - up).
BC