It's good to hear someone is out there doing something positive for
our kids. You have my respect!
As far as your project goes, I would say the sky is the limit,
depending on how much $$$$$$$$ you have to spend. But, I'm sure your
aware of that already. The 425 has potential but you could easily
swap it out for a 472 or a 500 cid (BIG CUBES = mwwwwaaaaaa!!!). Let
me suggest posting your engine concerns on the MTS messageboard
There are a few guys on the
messageboard with similiar projects as yours, so I'm sure they would
be more than willing to help. Also, MTS offers/sells everything you
need to (re)build your 425, 472 or 500 along with all the generous
advice you might expect!
MTS' website is www.500cid.com