As Wolfgang mentions, a Kafer brace for that engine would be a prudent move (do a search on here for Kafer Brace - there should be a bunch of hits) and I would also highly recommend a transaxle mid-mount (the Berg version is nice) to keep the power harnessed and to keep the transaxle from destroying the front (nose cone) frame mount (which you should swap out for a Rhino mount no matter what) on harder acceleration.
Beyond that, heed ALB’s advice and keep you foot out of it in first and second for a year or two, then decide whether you want a new/rebuilt beefier transaxle with different gearing to match how you drive.
Chuck Beck has quite the reputation so I would expect that engine to have some serious ‘Nads.
That’s just how Chuck rolls.