How bout similar block, more HP?Its the same engines I had. Dont want to modify anything, just drop them in place.
Maybe call this shop in Palatka and see what they'd give you for the swap outs.
https://www.ebay.com/itm/255390510113?epid=1452780843&hash=item3b7675ec21:g:BigAAOSwo3pWeanI
How bout similar block, more HP?
http://www.goldcoastpower.com/produ...ing-Take-Out--Marine-engines&product_ID=91300