I forgot the wampus is big bore. Listen to finch. Im doing a Super serval in a month and when we decided to go to the super, The cost went up a good bit. Price it out before you decide.
Off the top of my head, pistons where $75 extra and the cooling head was $300 with domes. And I think you need cases bored. Might as well get the cylinders ported too. Then there's carbs to feed the kitty.