My truck is a '55 1st series. I removed the 235 with 3 speed. Still running the 3.90 rear gears. My friend had a 261 removed from a '62 2 ton truck. I rebuilt the 261, .08 over, mild cam, electronic ignition, dual Carter Weber carbs, dual Fenton exhaust with a T5 transmission. It bolted up to the existing motor mount and bellhousing. This truck is a great runner for the highway or just around town driver.
Larry