Setting correct Timing for truck 360

I Got a 1984 R350 Dually work truck. The timing for it stock says 4 BTDC. R150-250 is 11 BTDC. Took the 84 engine out, put in 77 truck engine with 84 Dist., cam-lifters-p-rods n rockers. (someone stuck 4 BIG diameter pushrods in...dumbass thought motor was toast ) Edelbrock 318/360 intake, 1406 carb. Runs good. What should be the initial and total timing be ? I do have a Dial timing light. Timing marks are correct. Aftermarket Chain n gears looked good, but i had a chain tensioner on the shelf so i tossed it in. will be mostly used to haul big boat, car trailer, wood n steel. up hill both ways. Thanks, C300