If it were a class C I would do just that. It is a 27ft travco that weighs over 10k and will be pulling another 5 behind it. Some have also suggested a cummins but I have no interest listening to it rattle for hours on end.
Frankly, why worry about it.
As was pointed out, same rod ratio as a 454. I doubt you are going to put 200,000 miles on the thing.
If it down the road needs new rings and bearings, or even new pistons from side loading/ scuffing so what. You will have what you want until that day possibly down the road if it ever comes up.
If it does, freshen up and move on again
