You might want to check out the SN & JN series of portable hones, not quite so expensive. Not cheap either, but maybe half the cost. I bought an SN-75 model some 20 years ago, for 100cc cast iron cylinders, it works great. Just need a big 1/2 inch drill to turn it.
Billy, I have an expensive floor model Sunnen Hone with loads of smaller mandrels but nothing big enough to do Briggs World Formula. I ‘ve found those flex drill driven hones to be less accurate with bore roundness. These floor models get the bore perfect for me. just my take on it