My new small block Mopar (not an A body)

So I picked me up another Mopar to tinker on a couple of months ago. She's a 1973 Winnebago Brave D-20 with a 318-3 on a Dodge M30 chassis. When I bought it the odometer showed 57,900 miles and it was in overall great shape for the year. It has an Onan 2500 generator, ice cold AC and a newer recirculating toilet. I have alot of faith in an old Mopar, so I bought it , slapped plates on it, checked the oil, and drove it 90 miles to get it home. Then I did a tune up and had to do some work on the fuel system to get things flowing properly. It seems that the previous owner, in an attempt to get fuel to the generator, replaced the fuel tank transfer switch with a fuel pump. That, in turn, caused it to empty the rear tank and overfill the front tank, pouring 89 octane fuel with lead addative out the filler and onto the ground.:vom: I moved the electric pump to supply fuel to the generator only, and just T'd the lines together to supply fuel to the engine. I'll get a transfer switch in it soon.
We used it to go on vacation to Old Forge and took it to a snowmobile watercross race. I love the looks I get when I'm driving this thing, it reminds me of the looks I used to get when I had the 68 Dart on the road.






I can't seem to find ANY info on the 318-3. All I know is that it has different thread for the spark plugs. If anyone has any info on these engines, or can tell me how they are different from a regular 318, I would love to know more....