This is a common swap and there is a lot written on it in this forum. I'm not sure if anyone has a written step by step procedure. Since that year truck came with a V-8 you are basically doing a stock installation. Nothing from the 235 can be used for the conversion except for the clutch and that depends on which V-8 flywheel you obtain. You will need a V-8 bellhousing, flywheel, front motor mounts, ignition switch, exhaust system, throttle linkage, pulleys, hoses, and all the other V-8 components. If you send me an email direct and I can provide you with a spreadsheet which lists all the parts needed with some sources & estimated costs for the conversion.
Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine