Big block / small block

Well I got a 360 to shove into my truck. Im waiting for a bellhousing that I bought on ebay. Then all I need is the right flywheel.....and I should be ready to stick it in, and figgure out the mountings.

The 360 is from a camper, and the odometer said 62,000 miles. The engine looks clean inside, and I hope the 62k is accurate. The engine has a 2bbl carb, but I want to stick a 4bbl on it. I have a holley 650 spreadbore. Will this mate up to the spreadbore manifolds I see on ebay for mopar SB engines ? Will the engine accept the extra fuel/air OK ? I would guess it has an RV cam in it, but maybe not. It appears completely stock 1976, as installed in the camper.