Opinions needed on 72 to 75 D100 or W100 Dodge Truck

I had a 75 swb I used for a daily driver for years, most reliable old truck I've had, never should have gotten rid of it. I liked it so much when i saw a 78 d200 in my buddies yard I had to get it even though I need another project like a hole in my head. I found some good info over on moparts.com about lowering and disc brakes, the specific information escapes me it's been a while since I looked it up. I was told they share engine mounts with vans and van based RV's. If anyone can confirm that it would be great since not many people want those things, I picked up a 73 sportsman 360/727/d60 for $200.