I am looking for the specs on a 78 440 pulled from a motorhome.

I know its a low compression motor, but how low? Is there a difference between truck engines and the RV counterpart in the compression range? Are the RV heads different cc? Years ago I had a 78 D250 with a 440, and the heads on it used a tapered seat sparkplug rather than the compression washer style.

I have 906 heads I can use, but if thats not going to change the compression I'll probably just use what it has.

This is going to be a low budget spruce up using a whiplash cam, and other parts I have on the shelf. Just looking for a choppy idle grocery getter that makes people wonder if its fast.