So, what can I shoehorn into a Fiat 124?

Uhhh.....no. That's a little Buick motor.

HOLY CRAP A Ferd 5.0!!!

[URL="http://www.britishv8.org/MG/MervHagen/MervHagen-AC.jpg"][/URL]

After a bit of Google, this doesn't look like a very practical swap. Maybe a Ferd Ranger style V6??