go to Bassboatcentral.com and try to locate a used motor, you have a bunch of options, you can also buy a remanufactured powerhead from several shops, like i mentioned check on BBC.

as for the 4 stroke 130, i have a friend that his brother has a 17.5 bumblebee with a 140hp 4 stroke and he loves his, he said the fuel usage was cut by 2/3's. as for the speed if you need/want it stay with max HP rating

BTW, you can probably sell you damaged powerhead/parts,
and by all means don't just give your lower unit away