No worries.

The crate engines are typically made in Mexico. They normally have roller cams, big rods and other such goodies. Have a look at engines on summitracing.com and you'll get an idea of what they tend to have.

TKO's will fit but they aren't cheap. They are alien to a GM product as they are Ford based from memory. Muncie is standard fitment to HQ, but both will probably require some tunnel mods. I'd use a Muncie if I had to use a manual but i'd be using an auto as first preference. You can get 4L60's built pretty well for not a lot of money and these also go in with minimal mods and are overdrive.

Here is a complete Super T10 setup, not quite as good as a new M22 Muncie but next best thing and good strong boxes:

http://www.ebay.com.au/itm/richmond-...#ht_353wt_1153

You'll buy a whole new Muncie for under $2000US but you have to get it here and buy all bits to fit.

Eagle sell the bare bones crate engines which you'd have to dress:

http://www.ebay.com.au/itm/CHEV-350-...e#ht_524wt_916