Mugsy the heat is getting to you down there in. grin 230 and 250s are the same. The 292 has an extra port for the bypass hose. The story is that with the bypass hose the head tends to overheat, not a problem the 230 and 250.
Larry
68 C20 327/465 daily driver
63 C20 292/420 Camper truck
65 C10 ? /powerglide Custom Cab AC,PB,PS,$flashe
70 C10 250/3spd org/Gauge dash,Wood bed,4Sale$1300

I don't own a vehicle that isn't old enough to drink.