366 is an old school big block. I wasn't aware they were even in production in the 80's. By then, the only BB I'm aware of was the 454. Now I gotta go do some research...
Yeah, the height may be an issue. I've looked at a couple C50's and wondered if the bed will be at too steep of an angle when extended to the ground.
Found a bunch of ad's and the 366 and even 427's were still being installed in these trucks.
BIG question, though, does his have the spoke wheels or 10 bolt disc ? I'm not interested in dealing with the spoke wheels. Had enough of those years ago with working lose or wobbling if they weren't mounted perfectly straight.