You might get a slight bit more pulling power with a tall-block 366 cubic inch truck engine, but the weight will increase considerably, and none of your 350 accessories will bolt on. Another step up in power and displacement would be a 427 or 454, but they're both gas guzzlers. The big block engines don't like high RPM, but they're torque monsters and they don't need to rev up anyway. The 454 in our 35 foot Swinger motorhome is about as tough as a two dollar steak, but it really likes the gasoline!
Jerry
