I love it just as it sits. I also was looking for where the fuel pump was. They didn't do a TBI version of that engine in Canada or the U.S. but by then it was common on the V8s.

It does look like a 250, though the last references I personally have seen to the 292 being offered domestically was 1988 and  they were coming in from Mexico for use on the holdover 1987-style straight rail chassis cabs & crew cabs (R & V series, formerly C & K series which the new 1988+ trucks were now called). The R & V series ran from 1988 through 1990 and also included the Blazers & Suburbans, which all were updated to the new style for 1991.

The inline sixes with the firing sequence & intake port setup don't lend themselves all that well to port fuel injection, but a throttle body injection setup would work well with a log / branch intake on those engines. I never knew they did them (did they in fact?)

In Canada / U.S. the injected 4.3 V6 replaced the 250 (4.1) 2-barrel inline six for 1985.