A few have mentioned before that the 65mm throttle body from XF Falcons is a good one to use for modified 4 cylinder engines.

Some may be interested to know that I recently priced these at Pick & Payless wreckers in Blacktown for $50. The downside is that most of the EFI Fords there, already had the throttle bodies taken.

I also noticed a Triumph 2500PI which had 6 throttle bodies mounted in groups of two, rather like side draught carbies. These might be handy for hot EFI conversions on some cars. I didn't get their price, but going on what they sell other things for, I reckon it would be in the region of $100 for the set.