I don't know what's comfortable in a fast truck. I've not built trucks to go fast. Fastest truck I've ever owned went 14.50 with a stuck brake caliper (barely made it home) . The 14.50 truck was a D150 that I dropped in a 400 2bbl. I literally spent less than 200.00 on finding the 400, 727, and used rusty headers. I did nothing to the engine/tranny except I put a 625 carter on it that was giving to me for free and a cheap 4bbl intake. Truck had 3.21 gears.
