RB, I believe Macojoe keeps spare fuel and a bait tank under the old I/O engine box. *
There were 2 different hull designs of the V20 that were full transom models. *One was the OMC Seadrive and the other was the I/O. *Either one of these is a perfect bracket conversion hull. *The old engine compartment can be used as a fish box, spare fuel, bait tank, etc etc.
I went out to boat trader - couldn't find an I/O or seadrive in NC, but found a '78 that with a 20" transom. *Looks like they modified the splashwell a little.
http://adcache.boattraderonline.com/6/1/2/85235812.htm
By the way, the transom looks suspicious due to the metal plate that was added under the motor. Probably rotted all to hell.