This might sound nuts, but turbocharge the 292. You can do it on the cheap if you do enough research and shop around. In all reality it's not hard to do. This way you keep the 6, keep the gas mileage of the 6, but when you NEED power, it'll be there. Do a few web searches on the subject...

49 Chevy 3600
65 Chevy K10
48 International KB-1 Service Truck
55 Willys CJ5 - Chevy 331 powered
26 Model T Roadster Rat Rod
70 Tucker Sno-Cat 442-A
96 Dodge 3500 Cummins dually flatbed x-cab 4x4
06 Jeep Wrangler LJ rock crawler
If you can't fix it with a hammer, it's an electrical problem