An RV engine can be a bargain, or a money pit. As mentioned, many RVs have the Industrial 361 or the 413, both of which are pretty useless in a swap to a car or a pickup for many reasons. MUCH different heads, water pump housing and brackets, mounts, exhaust manifolds, eight-bolt crank with a different flange, oil pan & pickup, dipstick and tube...and much more. Some 440s are similarly configured, but the Industrial 413 or 361 are definitely NOT a player for a swap.
The RV exhaust manifolds on an RV are not the same as what would be on a '66 or '67 B-body car. You are going to want car manifolds, or perhaps headers, if that is what you want.
If you absolutely must have this engine, you must verify that it is not an industrial 361 or 413...they ARE different that the car 413 and 361. If it's a 440 for certain, you are probably in good shape.